The actual compound is CH3NH2 Methyl amine or Amino methane, BASE (wikipedia) For conjugate acid-base pair, identify the first species as an acid or a base and the second species as its conjugate base or conjugate acid. acidic. This is simple solution stoichiometry. Identify its conjugate acid or base. Why do we calculate the second half of frequencies in DFT? CH3OH+H+---CH3OH2+, Identify the acid-base reaction. In case you did not know, the part of the salt from the weak acid removes some of the H+ ions from the water equilibrium causing changes in this equilibrium that result in [OH-] increasing. a. NaNO3 b. Ba(C2H3O2)2 c. CH3NH3Cl d. C6H5NH3CHO2 e. CoBr3 NaClO- BASIC.When a weak acid reacts with a strong base the resulting solution will be basic. Now, construct an equilibrium equation for the weak base: $\ce{CH_3NH_2 + H_2O <=> HCH_3NH_2^+ + OH^-}\ \ \ \ \ \ $ or Likewise CH3NH3+ is the conjugate acid of the weak base, methylamine (CH3NH2). Acid-base strength (in Brnsted-Lowry terms) is a relative term: an acid is strong if the position of its dissociation equilibrium lies further to the right and the stronger an acid, the weaker its conjugate base. Therefore the salt is acidic because of CH3NH3+, a Bronsted acid. If an acid is not listed here, it is a weak acid. Cl- is a very weak conjugate base so its basicity is negligible. Basic Salt -Conjugate base of a weak acid c. Neutral Salt - Neither acidic or basic 1. and all calculations if to justify your answer. Who is Jason crabb mother and where is she? As an ionic compound, it does contain an anion, but the nitrate ion is on the list of neutral anions. g. NH3. For those that are not neutral, write balanced equation for reactions causing the solution to be acidic or basic and give the equilibrium constant for that reaction. Check for Understanding 6.3 1. You also have the option to opt-out of these cookies. Any acid that dissociates 100% into ions is called a strong acid.Strong and Weak Acids. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. For example, NH4Br is the salt of a weak base (NH3) and a strong acid (HBr), so the salt is acidic. Indicate whether solutions of the following salts would be acidic, basic, or pH-neutral. $$\begin{align} Chemistry. Therefore the salt is acidic because of CH3NH3+, a Bronsted acid. it can react as both an acid and a base. The problem is essentially like you are dissolving $\ce{CH3NH3Cl}$, Calculate pH at equivalence point [closed], We've added a "Necessary cookies only" option to the cookie consent popup, Figuring out the concentration of weak polyprotic acids in presence of strong acid, Calculating pH for titration of weak base with strong acid. c. LiCN In essence, you can go from an acid to its conjugate base State whether each of the following aqueous solutions would be acidic, basic, or neutral. Identify the following as a strong acid, a strong base, a weak acid, a weak base, or a neutral solution: a. LiBr b. CH3NH3Cl is an ionic compound, consisting of CH3NH3+ and Cl- ions. $\ce{HCH_3NH_2^+ <=> H^+ + CH_3NH_2}$. In fact the pH of a 5% expand_less. Expert Answer 1 . What happens to equivalence point pH of diluted vs undiluted? with it! + HA + H 2 O H 3 O + A Acid Base Conjugate Conjugate Acid of H 2 O Base of HA HA is the proton donor (the acid) and H 2 O is the proton acceptor (the base). Answer and Explanation: Due to the reactivity of this methylammonium cation, the solution of this salt compound will be acidic (pH below 7). Novocaine, C 13 H 21 O 2 N 2 Cl, is the salt of . (CH3NH3)Cl came from a weak base and strong acid so the solution would become more acidic => decrease in pH. This problem has been solved! 4. 4). convertire patente italiana in internazionale vitalik buterin public wallet address quanto costa vivere . Can I tell police to wait and call a lawyer when served with a search warrant? The CH3- ion is the conjugate base of methane, which is the weakest Brnsted acid in the table of Brnsted acids and their conjugate bases. Because HCl is listed in Table 12.2 "Strong Acids and Bases", it is a strong acid. B. a. NaNO3 b. Ba(C2H3O2)2 c. CH3NH3Cl d. C6H5NH3CHO2 e. CoBr3; Question: Indicate whether solutions of the following salts would be acidic, basic, or pH-neutral. If a substance feels slippery, is it an acid or a base? H_3C-NH_2 + H_2O rightleftharpoons H_3C-NH_2^+ + OH^- Methylamine is a reasonably strong base as bases go (pK_B = 3.36); it is also a potent nucleophile. Methylamine, CH3NH2 is a weak base. Does B(CH3)3 prefer to be an acid or base? vegan) just to try it, does this inconvenience the caterers and staff? Methylamine (CH3NH2) is a weak base and therefore cannot completely resist the attraction of water molecules to the extra proton in the CH3NH3+ ion. d) None of these. ), How to make a New Post (submit a question) and use Equation Editor (click for details), How to Subscribe to a Forum, Subscribe to a Topic, and Bookmark a Topic (click for details), Multimedia Attachments (click for details), Accuracy, Precision, Mole, Other Definitions, Bohr Frequency Condition, H-Atom , Atomic Spectroscopy, Heisenberg Indeterminacy (Uncertainty) Equation, Wave Functions and s-, p-, d-, f- Orbitals, Electron Configurations for Multi-Electron Atoms, Polarisability of Anions, The Polarizing Power of Cations, Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding), *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids), *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism), Coordination Compounds and their Biological Importance, Shape, Structure, Coordination Number, Ligands, *Molecular Orbital Theory Applied To Transition Metals, Properties & Structures of Inorganic & Organic Acids, Properties & Structures of Inorganic & Organic Bases, Acidity & Basicity Constants and The Conjugate Seesaw, Calculating pH or pOH for Strong & Weak Acids & Bases, Chem 14A Uploaded Files (Worksheets, etc. Answer and Explanation: Due to the reactivity of this methylammonium cation, the solution of this salt compound will be acidic (pH The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". b. NaOBr State whether each of the following aqueous solutions would be acidic, basic, or neutral. Answer: In short CH3CH2NH3Cl is acidic because it is formed from a strong acid (HCl) and a weak base (CH3CH2NH2). 7. Echemi shares different kinds of information about ch3nh3cl acid or base. c) Both acid and base. A solution consisting of 0.1 M CH3NH3Cl and 0.1 M CH3NH2 would be a more effective buffer than one containing 1.5 M CH3NH3Cl and 1.5 M CH3NH2 2. LIST ACID NH4ClO4 NH4Cl HBrO (WEAK) H2PO4- H3PO3 (WEAK) HNO3 (STRONG) HCl (STRONG) H2S (WEAK) H2SO4 (STRONG) H3PO4 (WEAK) H2CO3 (WEAK) HBr (STRONG HI (STRONG) HClO4 (STRONG) Weak acids and bases only partially ionize when they dissolve in water. Explain. All rights reserved. Use Ka for CH3NH3 + from #3 above and solve for [CH3NH3 +] using 1x10-2 for [H3O +] and [CH3NH2] How do you determine whether NH3 is an acid or a base? Start studying Acidic-Basic-Neutral Salts. Congratulations! $\ce{CH_3NH_2 + H_2O <=> HCH_3NH_2^+ + OH^-}\ \ \ \ \ \ $. Acids and Bases: Acids have the higher concentration of hydrogen ions when compared to hydroxide ions and bases have the Calculate the pH of a 0.75 M acetic acid solution. or neutral. However, you may visit "Cookie Settings" to provide a controlled consent. Strong Acid: An acid that has a very low pH (0-4). It is normal to cold feet before wedding? Calculate the pH at the equivalence point of a titration of 62 mL of 0.1 M C H X 3 N H X 2 with 0.20 M HCl. ( 3 point) For each of the following salts, identify the ion that will influence the pH of its aqueous solution (if any) and classify the solution as acidic, basic or neutral. is ch3nh3no3 an acid or base. Is OH- an acid or a base? Get the detailed answer: Is BaF2 acidic, basic, or neutral? My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? Let us help you simplify your studying. Predict whether the following solutions are acidic, basic, or nearly neutral Additional Chemistry Questions. You can score higher. The overall salt does not donate protons, the CH3NH3+ ion does (to form H3O+) when the salt is dissociated in water. How can a base be used to neutralize an acid? When methylamine acts as a base, for example, Is ch3nh3cl acidic or basic? 11 terms. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. Is CH3NH2 a weak base or weak acid? Answer: weak base The formula shown corresponds to methylamine. It is a covalent compound with C-H and N-H bonds. Is CH3NH2 a weak base in water? CH3NH2 is a weak base. By the definition of a Bronsted base, it is a proton acceptor. Is CH3NH2 a conjugate base? CH3NH3^ + CH3NH2 is a conjugate acid base pair. $$\begin{align} Write the equilibrium equations. What is error code E01-5 on Toyota forklift. c. H2O Maybe you'll get different insights into ch3nh3cl acid or base here. Strong acid + Strong base. (And we have already settled whether Ca2+ or Li+ was harder.). Acid Base Theories Arrhenius Definition acid--donates a hydrogen ion (H+) in water base--donates a hydroxide ion in water (OH-) This theory was limited to substances with those "parts"; ammonia is a MAJOR exception!. What experience do you need to become a teacher? For those that are not neutral, write balanced equation for reactions causing the solution to be acidic or basic and give the equilibrium constant for that reaction. Since CH 3 NH 3 Cl is an acidic salt, the solution is acidic. When certain soluble salts are dissolved in water the resulting solution is not neutral. As an ionic compound, it does contain an anion, but the nitrate ion is on the list of neutral anions. Is CH3NH3 a strong acid or base? Routing number of commercial bank of Ethiopia? Write the is CH3NH3Cl acidic basic or neutral? The cookie is used to store the user consent for the cookies in the category "Analytics". The overall salt does not donate protons, the CH3NH3+ ion does (to form H3O+) when the salt is dissociated in water. The HBr bond is therefore weaker than the HCl bond and HBr is thus a stronger acid than HCl. One such reaction was CH3NH2 + H2O. CH3NH2 is a base. It only takes a minute to sign up. Calculation involving the salt of a weak acid and a weak base. Based on the fact that CH3NH2 is the conjugate base, we will use KaKb = Kw to get the Kb. It is a weak acid and ionizes as follows: 2) We must determine the value for the Ka of NH4+: Bonus Example: The pH of a 0.160 M CH3NH3Cl solution is 5.500. The best answers are voted up and rise to the top, Not the answer you're looking for? base conjugate acid NH 3 NH 4 + CO 3 2-HCO 3-HNO 3 H 2 NO 3 + Check for Understanding 6.2 1. WebNote: in the first four problems, I give the K a of the conjugate acid (for example, the ammonium ion in Example #1). List molecules Acid and Base. YOU MUST MEMORIZE STRONG ACIDS AND STRONG BASES: everything other than these are considered as weak. b) Base. Therefore the salt is acidic because of CH3NH3+, a Bronsted acid.. Track your food intake, exercise, sleep and meditation for free. Get control of 2022! pH Scale and Acidity. Study a salt bridge as a component of an electrochemical cell and explore what it does. basic (you have to compare the ka to the kb) C5H5NClO4. State the main difference between acid and base. The methylammonium cation CH3NH3+ is similar to the ammonium (NH4+) which is somewhat acidic due to it being the conjugate acid of a weak base (NH3). For example, the acetate ion is the conjugate base of acetic acid, a weak acid. The overall salt does not donate protons, the CH3NH3+ ion does (to form H3O+) when the salt is An acid is a proton and a base is a proton. What is the conjugate acid of the base H2O? "Al"("NO"_3)_3 is strongly acidic because "Al"^(3+) is a Lewis acid. Subsequently, question is, is Ki acidic basic or neutral? Identify the following as a strong acid, a strong base, a Can a chemical compound be both an acid and a base? The value of Kw increases with increasing temperature. a. - neutral (NH 4 + is a weak acid, but C 2 H 3 O 2-is a weak base - the conjugate base of a weak acid, HC 2 H 3 O 2. I mentioned that C H X 3 C H X 2 N H X 2 is weak, meaning that this reaction is reversible: CH3NH3Cl acidic basic neutral KC104 acidic basic neutral COF2 acidic basic neutral Question : Is the aqueous solution of each of these salts acidic, basic, or neutral? Being part of the list of strong acids doesnt give any indication of how dangerous or damaging an acid is though. Compound. How do you get out of a corner when plotting yourself into a corner, Identify those arcade games from a 1983 Brazilian music video, How to handle a hobby that makes income in US, Bulk update symbol size units from mm to map units in rule-based symbology, Linear regulator thermal information missing in datasheet. This problem has been solved! Identify its conjugate acid or base. Depending on the composition of the salt (the ions which it is made up of) the solution will be either acidic or basic. What is the conjugate acid of CH3NH2? Given the following synthesis of ethyl 3-chloro-3 . Salt. Wiki User. The possible values on the pH scale range from 0 to 14. basic. 1 Chemical Foundations 2 Atoms, Molecules, And Ions 3 Stoichiometry 4 Types Of Chemical Reactions And Solution Stoichiometry 5 Gases 6 Thermochemistry 7 Atomic Structure And Periodicity 8 . Moreover, is nano2 acidic basic or neutral? Is the singer Avant and R Kelly brothers? c_{\ce{H+}} &= c_{\ce{CH3NH2}} \\ Acid and Base Ionization Constants. Made from an acid and a base, salt can react with water and produce acidic, basic, or neutral solutions. Here is the answer to your question: Conjugate acid of a weak base is acidic. Is H2S classified as an acid, a base, or a salt? B. Find the acid and base in the following reaction: Identify the following if acidic or basic. N2O5(s) + H2O(l) to 2HNO3(aq), Complete the given acid-base reaction.CH3CH2OH+NH2- ---------------------->. Methylamine is a Bronsted base, as it can accept a proton from water. HCl; Mg(OH) 2 C 5 H 5 N; Solution. This means that not every molecule breaks apart. What is the answer punchline algebra 15.1 why dose a chicken coop have only two doors? Give an example. Similarly, is CH3NH3Cl acidic basic or neutral? Breaking News Brookhaven, Ms, 3. Is an aqueous solution of CH3N H3Cl C H 3 N H 3 C l acidic, basic, or neutral? BUY. ClO- is the conjugate base of a weak acid, HClO, so it acts as a weak base in solution. Determination of pKb of a mono acidic base. When we hydrolyze the following compound we find that it is made up of a very weak base and a very strong acid. So, you're dealing with a sample of #CH_3NH_3Cl# that you've diluted to a total volume of #"500.00 mL"#.The aliquot, which measures #"15.00 mL"#, is titrated with #"47.32 mL"# of #NaOH#.. A base is defined as a proton acceptor or lone pair donor. Diluting a sample of weak base before titration. Knowing that NaNO2 is the salt of a strong base and weak acid calculate : a: pH of 0.100 M NaNO2 solution. The conjugate acids of strong bases are non-acids. 14 terms. 7. It is not as strong as inorganic bases like NaOH or KOH. Cl- is a very weak conjugate base so its basicity is negligible. Deduce the compound as acid base salt or other. b. LiOH These cookies ensure basic functionalities and security features of the website, anonymously. Often, these problems are given with the K b of the base and you have to calculate the value of the K a.You do so with this equation: K a K b = K w. You will see such a situation starting in the fifth example as well as scattered through the If you preorder a special airline meal (e.g. Necessary cookies are absolutely essential for the website to function properly. Most often asked questions related to bitcoin. The K X b = 4.4 10 4. In aqueous solution, the methylammonium ion acts as a weak acid. Identify the acid and the base in the following reaction: HF(aq) + OH-(aq) F-(aq) + H2O(l). Ag+1) are neutral.) WebIf a strong basea source of OH (aq) ionsis added to the buffer solution, those hydroxide ions will react with the acetic acid in an acid-base reaction: (11.8.1) H C 2 H 3 O 2 ( a q) + O H ( a q) H 2 O ( ) + C 2 H 3 O 2 ( a q) . Thus, the How can you calculate the pH of CH3NH3Cl with just 0.20 M given? The Kb for pyridine is 1.6 x 109. Is CH3NH3Cl an acid or base? This problem has been solved! But opting out of some of these cookies may affect your browsing experience. Ka for NH4+ is 1.00 x 10^-14 / 1.8 x 10^-5 = 5.6 x 10^-10. sodium cyanide =NaCN CN-is the conjugatebase of the weak acidHCN therefore the solution isbasic with a pH > 7 calcium perchlorate =Ca (ClO4)2 Ca2+is the cation of the strong base,Ca (OH)2. 16 Sets 1-2. Name the following compound: C2H5NH2. The first equation is for the reaction of some generic acid, HA, with H 2 O. Elaborated Notice that this compound is ionic, comprising $\ce{CH3CH2NH3+}$ cation and $\ce{Cl-}$ anion. The perchlorate ion ClO4- is the conjugate base of a strong acid (HClO4) thus the ClO4- ion has weak to none basic properties. Edit: At the equivalence point, the solution contains the dissolved salt $\ce{CH3NH3Cl}$, dissociated to $\ce{CH3NH3+ + Cl-}$, as @MaxW noted. copyright 2003-2023 Homework.Study.com. But how am i supposed to . Is HS- an acid or a base? The overall salt does not donate protons, the CH3NH3+ ion does (to form H3O+) when the salt is dissociated in water. Sault Tribe Housing Programs, Strong acids are 100% ionized in solution. answered by DrBob222 October 23, 2010 Answer this Question Still need help? The overall salt does not donate protons, the CH3NH3+ ion does (to form H3O+) when the salt is dissociated in water. I know for these problems, you can sometimes ignore parts of the solution for some reason. c_{\ce{H+}} &= c_{\ce{CH3NH2}} \\ 7. That gives us a L zero H 2 plus at H plus. Is a solution with OH- = 3.7 x 10-10 M acidic or basic? 1) The chemical reaction for the hydrolysis is: Example #5: Pyridine (C5H5N) is a weak base and reacts with HCl as follows: What is the pH of a 0.015 M solution of the pyridinium ion (C5H5NH+)? NaNO2. CH3NH3Cl is acidic, basic or neutral? If a pH is closer to 13, is the substance more acidic or basic? CH3NH3Cl + H2O -> CH3NH2Cl + H3O. But you have to compare the Ka and Kb for these species before making a judgement! Is CH3NH3Cl an acid or base? Add your answer and earn points. Identify its conjugate acid or base. What is a normal solution of an acid or a base? These cookies will be stored in your browser only with your consent. magentascorpion762. Beltrami County Jail Inmate List, g) Acidic h) Basic Reason: g) It is a conjugate of a weak base (ammonia) and strong acid ( H2SO4) hence it is acidic as its acidity is higher h) All metal oxides are basic or, metal conjugates are all basic and oxides are neutral (not sure about the oxide one) Dies geschieht in Ihren Datenschutzeinstellungen. Since CH3NH3Cl is an acidic salt, the solution is acidic. Adding more [CH3NH3+ to the initial buffer solution will increase the pH. Why does it seem like I am losing IP addresses after subnetting with the subnet mask of 255.255.255.192/26? Since CH3NH3Cl is an acidic salt, the solution is acidic. Experts are tested by Chegg as specialists in their subject area. Is NH3 a strong acid, strong base, weak acid, or weak base? At the equivalence point, the moles of CH3NH2 equals the moles of HCl. Q: Consider the acid-base nature of calcium fluoride, CaF2, when it is dissolved in water. Identify the following as a strong acid, a strong base, a weak acid, a weak base, or a neutral solution: a. LiBr b. Details of Acidic Basic and Neutral Salts - Compounds MP3 check it out.. ( 3 point) For each of the following salts, identify the ion that will influence the pH of its aqueous solution (if any) and classify the solution as acidic, basic or neutral. 3. H_3C-NH_2 + H_2O rightleftharpoons H_3C-NH_2^+ + OH^- Methylamine is a reasonably strong base as bases go (pK_B = 3.36); it is also a potent nucleophile. Check your inbox for more details. It is not as strong as inorganic bases like NaOH or KOH. Lucila Gamero De Medina Poemas, Three miners where the N. 03 minus forms a strong acid. 1) Here is the chemical reaction (net ionic) for the hydrolysis of NH4Cl: 3) We can then substitute values into the Ka expression in the normal manner: 4) Ignoring the minus x in the usual manner, we proceed to sove for the hydronium ion concentration: 5) We then calculate the pH directly from the [H3O+] value: Example #2: What is the pH of a 0.100 M solution of methyl ammonium chloride (CH3NH3Cl). Dimethylamine and trimethylamine are co-produced; the reaction kinetics Mcdowell Hall American University, Acidic substances have pH values ranging from 1 to 7 (1 being the most acidic point on the pH scale) and alkaline or basic substances have pH values ranging from 7 to 14. CO3 5-0 Answer: pH: 1.00 . HNO2. The ions from KCl derive from a strong acid (HCl) and a strong base (KOH). One of the questions said: "Using the Bronsted-Lowry theory of acids and bases, write equations for the following acid-base reactions and indicate each conjugate acid-base pair." You'll get a detailed solution from a subject matter expert that helps you learn core concepts. 1. acid conjugate base HNO 3 NO 3-H 2 SO 4 HSO 4-H 2 O OH-2. It is also incredibly smelly, and when you open a can the whole world knows (or at least the whole floor in your department). a. LiBr Elaborated Notice that this compound is ionic, comprising C H X 3 C H X 2 N H X 3 X + cation and C l X anion. Ammonium Bromide is strong electrolyte when put in water: NH4Br(s) NH4+(aq) + Br(aq). Is ClO_2^- a Bronsted acid, base, or both? ), Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams, Work, Gibbs Free Energy, Cell (Redox) Potentials, Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH), Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust, Kinetics vs. Thermodynamics Controlling a Reaction, Method of Initial Rates (To Determine n and k), Arrhenius Equation, Activation Energies, Catalysts, Chem 14B Uploaded Files (Worksheets, etc. See Table 16.1 Know strong acids/bases assume everything else is weak! (Hint: calculate the Ka for the pyridinium ion and use it in the calculation.). What is the conjugate acid of HONH2? Analytical cookies are used to understand how visitors interact with the website. CH3NH3Cl acidic basic neutral KC104 acidic basic neutral COF2 acidic basic neutral. magentascorpion762. 7. Depending on the composition of the salt (the ions which it is made up of) the solution will be either acidic or basic. piastre in cemento 100x50 Tak Berkategori. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. The conjugate acid of HC3NH2 is CH3NH3^1+ Conjugate acid of Ch3NH2? Is the autoionization 05:11. In chemistry, the BrnstedLowry theory is an acidbase reaction theory, proposed independently by Johannes Nicolaus Brnsted and Thomas Martin Lowry in 1923. Question: Find the parent acid and base of CH3NH3Cl. The $\ce{K_b}=4.4\cdot10^{-4}$. Identify the nature of the salts in an aqueous solution. So you know Cl- is the conjugate base of a strong acid (HCl) and knowing the conjugate seesaw, that means Cl- is very weak. ( pK_b + \log{c_{\ce{CH3NH3+}} } ) As you know, a Bronsted - Lowry acid is a chemical species that donates a proton, "H"^(+), in a chemical reaction. Um, thus so a decision. If you continue to use this site we will assume that you are happy with it. 3) Salt of a Strong Acid + Weak base----> acidic solution. If the [CH3NH2] in the solution after hydrolysis is 4.76E-8 M, calculate the equilibrium concentration of CH3NH3Cl. Now. Methylamine is a stronger base than the conjugate acid is as an acid because of the values of Ka and Kb. A solution of CH3NH3Cl hydrolyzes according to the equation. https://www.thinglink.com/scene/636594447202648065 ACID (wikipedia) An acid is a molecule or ion capable of donating a hydron (proton or hydrogen ion H+), or, alternatively, capable of forming a covalent bond with an electron pair (a Lewis acid). d) NH4NO2 NH4 + + NO 2-NH4 + is the conjugate acid of NH 3, a weak base, so it is a weak acid: NH4 + + H 2O NH3 + H3O + K a = Kw/Kb(NH3) = 5.6 x 10-10 NO2-is the conjugate base of HNO 2, a WEAK acid, so it is a weak base: NO2 . See the answer See the answer done loading. A. Al(NO3)3Al. d. HNO3 If a substance has a pH lower than 7, it is an acid. Note: in the first four problems, I give the Ka of the conjugate acid (for example, the ammonium ion in Example #1). 10th Edition. The conjugate base of an acid is the anion that results when the acid molecule loses its hydrogen to a base. Cl- is a very weak conjugate base so its basicity is negligible. Postby Anthony Tam Fri Jan 28, 2022 4:33 am.