Chapter 21, Problem 78PS

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

Chapter
Section

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

# The hypohalite ions, XO−, are the anions of weak acids. Calculate the pH of a 0.10 M solution of NaClO. What is the concentration of HClO in this solution?

Interpretation Introduction

Interpretation:

The pH of a 0.10M solution of NaClO and the concentration of HClO has to be given.

Concept introduction:

The pOH is a measure of Hydroxide ion concentration and pH is a measure of Hydrogen ion concentration.

pOH=log[OH] (1)

The sum of pH and pOH is equal to 14 at 25°C.

pH+pOH=14 (2)

For a general reaction; aA+bBcC+dD

The equilibrium constant for this reaction can be written as follows,

Kc=[C]c[D]d[A]a[B]b

Explanation

An equilibrium constant (K) is the ratio of the concentration of products and reactants raised to appropriate stoichiometric coefficient at equilibrium.

The dissociation of NaClO with water is written as follows,

â€‚Â NaClO(aq)+H2O(l)â‡ŒHClO(aq)+OHâˆ’(aq)

The relative strength of an acid and base in water can be also expressed quantitatively with an equilibrium constant as follows:

Kb=[HClO][OHâˆ’][NaClO] (3)

An equilibrium constant (K) with subscript b indicates that it is an equilibrium constant of the base in water.

Refer to the appendix H for the value of Kb for NaClO.

The dissociation constant for NaClO is 0.28Ã—10âˆ’6.

The initial concentration of NaClO is 0.10â€‰M.

Set up an ICE table for the dissociation of NaClO with water,

EquilibriumNaClO(aq)+H2O(l)â‡ŒHClO(aq)+OHâˆ’(aq)Initial(M)0.1000Changeâˆ’x+x+xAtâ€‰Equilibrium0

### Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

#### The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started