Chapter 14, Problem 92E

### Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097

Chapter
Section

### Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

# What are the major species present in the following mixtures of bases?a. 0.050 M NaOH and 0.050 M LiOHb. 0.0010 M Ca(OH)2 and 0.020 M RbOHWhat is [OH−] and the pH of each of these solutions?

(a)

Interpretation Introduction

Interpretation: A solution prepared by mixing the given amount of bases is given. The major species present, [OH] and the pH of this solution is to be calculated.

Concept introduction: The pH of a solution is define as a figure that expresses the acidity of the alkalinity of a given solution. A logarithmic scale is used on which, the value 7 corresponds to a neutral species, a value less than 7 corresponds to an acid and a value greater than 7 corresponds to a base.

The pH of a solution is calculated by the formula, pH=log[H+]

The pOH of a solution is calculated by the formula, pOH=log[OH]

The sum, pH+pOH=14

To determine: The major species present, [OH] and the pH of the given solution.

Explanation

Explanation

The major species present in the given solution are Na+ , Li+ , OH and H2O .

Both NaOH and LiOH are strong bases. Therefore, these will completely dissociate into ions. The major species that are present are Na+ , Li+ , OH and H2O .

The [OH] is 0.10M_ .

The reactions involved are,

NaOH(aq)Na+(aq)+OH(aq)LiOH(aq)Li+(aq)+OH(aq)

Both NaOH and LiOH are strong bases. Therefore, these will completely dissociate into ions.

Hence, the total [OH] =[OH]fromNaOH+[OH]fromLiOH=0

(b)

Interpretation Introduction

Interpretation: A solution prepared by mixing the given amount of bases is given. The major species present, [OH] and the pH of this solution is to be calculated.

Concept introduction: The pH of a solution is define as a figure that expresses the acidity of the alkalinity of a given solution. A logarithmic scale is used on which, the value 7 corresponds to a neutral species, a value less than 7 corresponds to an acid and a value greater than 7 corresponds to a base.

The pH of a solution is calculated by the formula, pH=log[H+]

The pOH of a solution is calculated by the formula, pOH=log[OH]

The sum, pH+pOH=14

To determine: The major species present, [OH] and the pH of the given solution.

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