   # The weak base, CIO − (hypochlorite ion), is used in the form of NaCIO as a disinfectant in swimming pools and water treatment plants. What are the concentrations of HCIO and OH − and the pH of a 0.015 M solution of NaCIO? ### Chemistry & Chemical Reactivity

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

#### Solutions

Chapter
Section ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 16.7, Problem 4CYU
Textbook Problem
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## The weak base, CIO− (hypochlorite ion), is used in the form of NaCIO as a disinfectant in swimming pools and water treatment plants. What are the concentrations of HCIO and OH− and the pH of a 0.015 M solution of NaCIO?

Interpretation Introduction

Interpretation:

The concentration of HClO and OH- has to be determined and the pH of a 0.015 M solution of NaClO also to be determined.

Concept introduction:

Dissociation constants are the equilibrium constants for the ionization reactions.

For the general acid HA:

HA (aq) + H2O (l) H3O+ (aq) + A-(aq)                 Ka = [H3O+][A-][HA]

For the general base,

B (aq) + H2O (l) BH+(aq) + OH-(aq)               Kb[BH+][OH-][B]

pH Can be calculated using following formula,

pH + pOH = 14.00

### Explanation of Solution

The equilibrium reaction is as follows.

ClO-(aq) + H2O(l) HClO (aq) + OH-(aq)

The constant for the reaction is as follows.

Kb=  [HClO][OH-][ClO-]

For this reaction enter the concentrations before equilibrium established, the change that occurs as the reaction proceeds to equilibrium and the concentrations hen equilibrium has been established.

ClO(aq) + H2O(l) HClO(aq)       +      OH             0.015                                   0         0C-x         +x+xE(0

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