Chemistry & Chemical Reactivity
10th Edition
ISBN: 9781337399074
Author: John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher: Cengage Learning
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Chapter 16, Problem 35PS
The trimethylammonium ion, (CH3)3NH+, is the conjugate acid of the weak base trimethylamine, (CH3)3N. A chemical handbook gives 9.80 as the pKa value for (CH3)3NH+. What is the value of for(CH3)3N?
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Calculate the pH of a 0.295 M solution of ethylenediamine (H₂NCH,CH,NH₂). The pKa values for the acidic form of
ethylenediamine (HNCH,CH,NH) are 6.848 (pKa1) and 9.928 (pKa2).
pH =
Calculate the concentration of each form of ethylenediamine in this solution at equilibrium.
[H2NCH2CH2NH₂] =
[H2NCH,CH,NH] =
[HNCH,CH,NH3] =
M
M
M
Calculate the pH of a 0.123 M solution of ethylenediamine (H₂NCH₂CH₂NH₂). The pKą values for the acidic form of
ethylenediamine (H3NCH₂CH₂NH³) are 6.848 (pKal) and 9.928 (pKa2).
pH =
Calculate the concentration of each form of ethylenediamine in this solution at equilibrium.
[H₂NCH₂CH₂NH₂] :
=
[H₂NCH₂CH₂NH3]
=
M
M
A weak acid, HA, has a pKa = 6.2. If a solution of NaA(aq) is prepared, what does the pH of the solution need to be adjusted to in order to achieve the following ratios of deprotonated to protonated species?
1) [A-] / [HA] = 0.01
2) [A-] / [HA] = 10
3) [A-] / [HA] = 1
4) [A-] / [HA] = 106
Note: NaA is the sodium salt of , the conjugate base of HA. Assume NaA completely dissociates in water.
Chapter 16 Solutions
Chemistry & Chemical Reactivity
Ch. 16.2 - What are the hydronium ion and hydroxide ion...Ch. 16.4 - For each of the following salts in water, predict...Ch. 16.5 - (a) Which is the stronger Bronsted acid, HCO3 or...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. 16.8 - What is the pH of a 0.10 M solution of oxalic...Ch. 16.10 - Prob. 1.1ACP
Ch. 16.10 - Prob. 1.2ACPCh. 16.10 - The pKa, of the conjugate acid of atropine is...Ch. 16.10 - Convert the pK values to K values for the...Ch. 16.10 - Other solvents also undergo autoionization. (a)...Ch. 16.10 - Prob. 2.3ACPCh. 16.10 - Prob. 2.4ACPCh. 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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CH3NH2(aq) +...Ch. 16 - A 2.5 103 M solution of an unknown acid has a pH...Ch. 16 - A 0.015M solution of a base has a pH of 10.09 a)...Ch. 16 - What are the equilibrium concentrations of...Ch. 16 - The ionizations constant of a very weak acid, HA...Ch. 16 - What are the equilibrium concentration of H3O+, CN...Ch. 16 - Phenol (C6H5OH) commonly called carbolic acid is a...Ch. 16 - What are the equilibrium concentrations of...Ch. 16 - A hypothetical weak base has Kb=5.0104.Calculate...Ch. 16 - The weak base methylamine, CH3NH2, has Kb=4.2104....Ch. 16 - Calculate the pH of a 0.12 M aqueous solution of...Ch. 16 - Calculate the pH of a 0.0010 M aqueous solution of...Ch. 16 - A solution of hydrofluoric acid, HF, has a pH of...Ch. 16 - Calculate the hydronium ion concentration and pH...Ch. 16 - Calculate the hydronium ion concentration and pH...Ch. 16 - Sodium cyanide is the salt of the weak acid HCN....Ch. 16 - The sodium salt of propionic acid, NaCH3CH2CO2 is...Ch. 16 - Calculate the hydronium ion concentration and pH...Ch. 16 - Calculate the hydronium ion concentration and the...Ch. 16 - For each of the following cases, decide whether...Ch. 16 - For each of the following cases, decide whether...Ch. 16 - Oxalic acid, H2C2O4, is a diprotic acid. 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