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Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097

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BuyFindarrow_forward

Chemistry

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

Which of the following conditions indicate a basic solution at 25°C?

a. pOH = 11.21

b. pH = 9.42

c. [OH] > [H+]

d. [OH] > 1.0 × 10−7M

Interpretation Introduction

Interpretation: The condition that indicates a basic solution at 25°C is to be identified from the given conditions.

Concept introduction: The scale of acidity from 0 to 14 is known as pH scale. The solution having pH value less than seven is considered as acid whereas the solution having pH value greater than seven is considered as base.

Similarly, the solution having pOH value less than seven is considered as base whereas the solution having pOH value greater than seven is considered as acid.

Explanation

Explanation

Reason for correct answers:

(b)

To determine: If pH=9.42 indicates a basic solution at 25°C .

Yes, pH=9.42 indicates a basic solution.

The value of pH=9.42 is greater than seven. Hence, it indicates a basic solution.

(c)

To determine: If [OH]>[H+] indicates an basic solution at 25°C ..

Yes, [OH]>[H+] indicates a basic solution.

The basic solutions are those solution in which the concentration of hydrogen ions ([H+]) is very low and hydroxide ions ([OH]) is very large, that is,

[OH]>[H+]

Hence, the given condition indicates a basic solution.

(d)

To determine: If [OH]>1.0×107M indicates an basic solution at 25°C .

Yes, [OH]>1.0×107M indicates a basic solution.

Given

[OH]>1.0×107M

Taking log on both sides,

[OH]>1

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