Chemistry: Principles and Practice
Chemistry: Principles and Practice
3rd Edition
ISBN: 9780534420123
Author: Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher: Cengage Learning
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Chapter 15, Problem 15.43QE

(a)

Interpretation Introduction

Interpretation:

pH and pOH of 0.050 M HCl the solution has to be determined.

Concept Introduction:

Water is a compound that can act as an acid or a base. A water molecule can donate a proton as well as it accepts a proton. Water molecules can react with other molecule of water to produce hydronium ion and hydroxide ion. This reaction is called as autoionization of water. In this reaction, water can be an acid or base.

The reaction of autoionization of water is as follows:

  H2O+H2OH3O++OH

The equilibrium constant for autoionization of water is denoted by K'.

The expression for K' is as follows:

    K'=[H3O+][OH][H2O]2        (1)

Also, water is pure liquid. Its concentration does not appear. Therefore, the equilibrium constant K' will become Kw for pure water.

The expression for Kw is as follows:

    Kw=[H3O+][OH]        (2)

Also at 25°C, Kw is equal to 1.0×1014. The equation (2) will be modified as follows:

  1.0×1014=[H3O+][OH]        (3)

The negative logarithm of the molar concentration of hydronium ion is called pH. The expression for pH is as follows:

    pH=log10[H3O+]        (4)

Also, the relation between pH and concentration is as follows:

  [H3O+]=10pH        (5)

The expression for pOH is as follows:

  pOH=log10[OH]        (6)

Also, the relation between pOH and concentration is as follows:

    [OH]=10pOH        (7)

The relation between pH and pOH at 25°C is as follows:

  pH+pOH=14        (8)

(b)

Interpretation Introduction

Interpretation:

pH and pOH of 0.024 M KOH solution has to be determined.

Concept Introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

pH and pOH of 0.014 M HClO4 solution has to be determined.

Concept Introduction:

Refer to part (a).

(d)

Interpretation Introduction

Interpretation:

pH and pOH of 1.05 M NaOH solution has to be determined.

Concept Introduction:

Refer to part (a).

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Chapter 15 Solutions

Chemistry: Principles and Practice

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