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Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

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Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 16, Problem 46PS
Textbook Problem
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Methylamine, CH3NH2, is a weak base.

CH3NH2(aq) + H2O(ℓ) ⇄ CH3NH3+(aq) + OH(aq)

If the pH of a 0.065 M solution of the amine is 11.70, what is the value of Kb?

Interpretation Introduction

Interpretation:

The base ionization constant (Kb) of weak base methylamine has to be ientified.

Concept introduction:

The base dissociation constant or base ionization constant of weak base methylamine. can be calculated by using the pOH value of methylamine. base (which gives the concentration of hydroxide ion) and from the given concentration of. weak base methylamine.

Explanation of Solution

Given data

The pH of the methylamine.base is 11.70

The concentration of methylamine base is 0.065M

Calculate the base dissociation constant (Kb) for the base as follows -

It is known that:pH + pOH = 14

 pOH = 14 - pH =14 - 11.70=2.3

Therefore, [OH] can be calculated as:

pOH=log[OH]2.30=log[OH][OH]=5.0×103M

The ICE Table for the dissociation of methylamine base is represented as below:

EquilibriumCH3NH2(aq)+H2O(l)CH3NH3+(aq)+OH(aq)Initial(M)0.06500Change(M)x+x+xEquilibrium(M)0

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Chapter 16 Solutions

Chemistry & Chemical Reactivity
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Ch. 16.3 - 3. Which of the following has a pKa value of...Ch. 16.3 - 4. What is the pK2 for the conjugate acid of...Ch. 16.3 - Ka for lactic acid, CH3CHOHCO2H, is 1.4 x 104....Ch. 16.4 - For each of the following salts in water, predict...Ch. 16.4 - 1. Adding NaH2PO4 to water will cause the pH...Ch. 16.4 - 2. Adding KCN to water will cause the pH...Ch. 16.5 - (a) Which is the stronger Bronsted acid, HCO3 or...Ch. 16.5 - 1. Is the reaction of NaCN and HCI in water...Ch. 16.5 - 2. In the following reaction, does the equilibrium...Ch. 16.6 - Equal amounts (moles) of HCl(aq) and NaCN(aq) are...Ch. 16.6 - 2. Equal amounts (moles) of acetic acid(aq) and...Ch. 16.6 - Equal amounts (moles) of NaOH(aq) and NaH2PO4(aq)...Ch. 16.7 - A solution prepared from 0.055 mol of butanoic...Ch. 16.7 - What are the equilibrium concentrations of acetic...Ch. 16.7 - What are the equilibrium concentrations of HF, F...Ch. 16.7 - The weak base, CIO (hypochlorite ion), is used in...Ch. 16.7 - Calculate the pH after mixing 15 mL of 0.12 M...Ch. 16.7 - 1. What is [H3O+] in a 0.10 M solution of HCN at...Ch. 16.7 - 2. A 0.040 M solution of an acid, HA, has a pH of...Ch. 16.7 - What are the pH and ion concentrations in a...Ch. 16.7 - 4. You mix 0.40 g of NaOH with 100 mL of 0.10 M...Ch. 16.7 - If a fatal does of atropine is 100. mg. what...Ch. 16.7 - When atropine is added to sulfuric acid, a proton...Ch. 16.7 - The pKa, of the conjugate acid of atropine is...Ch. 16.8 - What is the pH of a 0.10 M solution of oxalic...Ch. 16.8 - Hydrazine (N2H4) is like CO32 in that it is a...Ch. 16.9 - Which of the following is the stronger acid? (a)...Ch. 16.9 - Which of the following should be the stronger...Ch. 16.9 - 3. Which of the following should be the stronger...Ch. 16.10 - 1. Which of the following can act as a Lewis acid?...Ch. 16.10 - 2. The molecule whose structure is illustrated...Ch. 16.10 - Convert the pK values to K values for the...Ch. 16.10 - Other solvents also undergo autoionization. (a)...Ch. 16.10 - Write an equation for the reaction of the amide...Ch. 16.10 - Will a solution of HClO4 in glacial acetic acid be...Ch. 16.10 - To measure the relative strengths of bases...Ch. 16 - Write the formula and the give the name of the...Ch. 16 - Write the formula and give the name of the...Ch. 16 - What are the products of each of the following...Ch. 16 - What are the products of each of the following...Ch. 16 - Write balanced equations showing how the hydrogen...Ch. 16 - Write a balanced equation showing how the HPO42...Ch. 16 - In each of the following acid-base reactions,...Ch. 16 - In each of the following acid-base reactions,...Ch. 16 - An aqueous solution has a pH of 3.75. What is the...Ch. 16 - A saturated solution of milk of magnesia. Mg(OH)2,...Ch. 16 - What is the pH of a 0.0075 M solution of HCl? 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What is its Ka...Ch. 16 - Which is the stronger of the following two acids?...Ch. 16 - Which is the stronger of the following two acids?...Ch. 16 - Chloroacetic acid (ClCH2CO2H) has Ka = 1.41 103....Ch. 16 - A weak base has Kb = 1.5 109. What is the value...Ch. 16 - The trimethylammonium ion, (CH3)3NH+, is the...Ch. 16 - The chromium(III) ion in water, [Cr(H2O)6]3+. Is a...Ch. 16 - Acetic acid and sodium hydrogen carbonate, NaHCO3,...Ch. 16 - Ammonium chloride and sodium dihydrogen phosphate,...Ch. 16 - For each of the following reactions, predict...Ch. 16 - For each of the following reactions, predict...Ch. 16 - Equal molar quantities of sodium hydroxide and...Ch. 16 - Equal molar quantities of hydrochloric acid and...Ch. 16 - Equal molar quantities of acetic acid and sodium...Ch. 16 - Equal molar quantities of ammonia and sodium...Ch. 16 - A 0.015 M solution of hydrogen cyanate, HOCN, has...Ch. 16 - A 0.10 M solution of chloroacetic acid, CICH2CO2H,...Ch. 16 - A 0.025 M solution of hydroxyl amine has a pH of...Ch. 16 - Methylamine, CH3NH2, is a weak base. 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Write a...Ch. 16 - Sodium carbonate is a diprotic base. Write a...Ch. 16 - Prove that Ka1 Kb2 = Kw for oxalic acid H2C2O4,...Ch. 16 - Prove that Ka3 Kb1 = Kw for phosphoric acid,...Ch. 16 - Sulphurous acid, H2SO3, is a weak acid capable of...Ch. 16 - Ascorbic acid (vitamin C, C6H8O6) is a diprotic...Ch. 16 - Hydrazine, N2H4, can interact with water in two...Ch. 16 - Ethylene diamine, H2NCH2CH2NH2, can interact with...Ch. 16 - Which should be stronger acid, HOCN or HCN?...Ch. 16 - Which should be the stronger Brnsted acid,...Ch. 16 - Explain why benzene sulfonic acid is a Brnsted...Ch. 16 - The structure of ethylene diamine is illustrated...Ch. 16 - Decide whether each of the following substances...Ch. 16 - Decide whether each of the following substances...Ch. 16 - Carbon monoxide forms complexes with low-valent...Ch. 16 - Trimethylamine, (CH3)3N, is a common reagent. It...Ch. 16 - About this time, you may be wishing you had an...Ch. 16 - Consider the following ions: NH4+, CO32, Br, S2,...Ch. 16 - A 2.50 g sample of a solid that could be Ba(OH)2...Ch. 16 - In a particular solution, acetic acid is 11%...Ch. 16 - Hydrogen, H2S, and sodium acetate, NaCH3CO2 are...Ch. 16 - For each of the following reactions predict...Ch. 16 - A monoprotic acid HX has Ka = 1.3 103. Calculate...Ch. 16 - Arrange the following 0.10M solutions in order of...Ch. 16 - m-Nitrophenol, a weak acid, can be used as a pH...Ch. 16 - The butylammonium ion, C4H9NH3+, has a Ka of 2.3 ...Ch. 16 - The local anaesthetic novocaine is the hydrogen...Ch. 16 - Pyridine is weak organic base and readily forms a...Ch. 16 - The base ethylamine (CH3CH2NH2) has a Kb of. A...Ch. 16 - Chloroacetic acid, ClCH2CO2H, is a moderately weak...Ch. 16 - Saccharin (HC7H4NO3S) is a weak acid with pKa =...Ch. 16 - Given the following solutions: (a) 0.1 M NH3 (b)...Ch. 16 - For each of the following salts, predict whether a...Ch. 16 - Nicotine, C10H14N2, has two basic nitrogen atoms...Ch. 16 - Oxalic acid is a relatively weak diprotic acid....Ch. 16 - The equilibrium constant for the reaction of...Ch. 16 - The equilibrium constant for the reaction of...Ch. 16 - Calculate the pH of the solution that results from...Ch. 16 - To what volume should 1.00 102 mL of any weak...Ch. 16 - The hydrogen phthalate ion, C8HsO4, is a weak acid...Ch. 16 - You prepare a 0.10 M solution of oxalic acid,...Ch. 16 - You mix 30 0 mL of 0.15 M NaOH with 30.0 mL of...Ch. 16 - Describe an experiment that will allow you to...Ch. 16 - The data below compare the strength of acetic acid...Ch. 16 - You have three solutions labeled A, B, and C. You...Ch. 16 - A hydrogen atom in the organic base pyridine,...Ch. 16 - Nicotinic acid, C6H5NO2, is found in minute...Ch. 16 - Equilibrium constants can be measured for the...Ch. 16 - Sulfanilic acid, which is used in making dyes, is...Ch. 16 - Amino acids are an important group of compounds....Ch. 16 - How can water be both a Brnsied base and a Lewis...Ch. 16 - The nickel(II) ion exists as [Ni(H2O)4]2+ in...Ch. 16 - The halogens form three stable, weak acids, HOX....Ch. 16 - The acidity of the oxoacids was described in...Ch. 16 - Perchloric acid behaves as an acid, even when it...Ch. 16 - You purchase a bottle of water. On checking its...Ch. 16 - Iodine, I2, is much more soluble in an aqueous...Ch. 16 - Uracil is a base found in RNA Indicate sites in...Ch. 16 - Chemists often refer to the decree of ionization...Ch. 16 - Consider a salt of a weak base and a weak acid...

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