Organic Chemistry
Organic Chemistry
6th Edition
ISBN: 9781936221349
Author: Marc Loudon, Jim Parise
Publisher: W. H. Freeman
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Chapter 3, Problem 3.17P
Interpretation Introduction

(a)

Interpretation:

The pKb of acetate, CH3CO2 is to be predicted.

Concept introduction:

Dissociation constant Ka is used to measure the strength of a Brønsted acid. There is an inverse relationship between the acidity of a Brønsted acid and its pKa value. Higher the value of pKa, weaker is the acid.

Interpretation Introduction

(b)

Interpretation:

The reason as to why an aqueous solution of acetic acid has an acidic pH, whereas an aqueous solution of sodium acetate has a basic pH is to be stated.

Concept introduction:

Dissociation constant Ka is used to measure the strength of a Brønsted acid. There is an inverse relationship between the acidity of a Brønsted acid and its pKa value. Higher the value of pKa, weaker is the acid.

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8. (a) HA(aq) is a weak acid with a dissociation constant, Ka, of 8.8 x 10−12. What is the pH of a 0.022 M solution of A−(aq)? The temperature is 25 ◦C. (b)  For the reaction A(g) =A(l), the equilibrium constant is 0.666 at 25.0 ◦C and 0.222 at 75.0 ◦C. Making the approximation that the entropy and enthalpy changes of this reaction do not change with temperature, at what temperature will the equilibrium constant be equal to 0.777?
The ionization constant of lactic acid, CH,CH(OH)CO,H, an acid found in the blood after strenuous exercise, is 1.36 x 10-4. What is the concentration of hydronium ion in the solution of 0.102 M lactic acid? CH;CH(OH)CO,H (aq) + H,O (1) → H;O• (aq) + CH;CH(OH)CO, (aq) O 0.00372 M O 0.0165 M O 0.00549 M O 0.227 M
Hydrogen cyanide, HCN(aq), is a weak acid with pKa = 9.2. What is the pH of 2.5M HCN(aq)?
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