   Chapter 14, Problem 30Q

Chapter
Section
Textbook Problem

# Which of the following statements is(are) true? Correct the false statements.a. When a base is dissolved in water, the lowest possible pH of the solution is 7.0.b. When an acid is dissolved in water, the lowest possible pH is 0.c. A strong acid solution will have a lower pH than a weak acid solution.d. A 0.0010-M Ba(OH)2 solution has a pOH that is twice the pOH value of a 0.0010-M KOH solution.

Interpretation Introduction

Interpretation:

The given statements has to be analyzed and if it is false, the true statements must be given.

Explanation

Given statements and analyzations:

1. a. When a base is dissolved in water, the lowest possible pH of the solution is 7.0 .

The given statement is false.

The pH value 7 corresponds to a neutral species. The lowest possible pH of a base dissolved in water would be more than 7 .

1. b. When an acid is dissolved in water, the lowest possible pH of the solution is 0.0 .

The given statement is false.

The pH value for an acid can also be negative if the molarity of the hydrogen ions is greater than 1 . For example, the pH value of a 12M HCl solution will be negative.

The pH value is calculated by the formula,

pH=log[H+]

• Substitute the value of the concentration of [H+] as 12 in the above expression.

pH=log(12)=1.08

1. c. A strong acid solution will have a lower pH than a weak acid solution.

The given statement is true.

The value of pH is inversely proportional to the strength of an acid.

1. d. A 0.0010M Ba(OH)2 solution has a pOH that is twice the pOH value of a 0.0010M KOH solution.

The given statement is false.

Two hydroxide ions are present in Ba(OH)2 .

The concentration of [OH] =(2×0.001M)=0.002M

• The pOH value is calculated by the formula,

pOH=log[OH]

• Substitute the value of the concentration of [OH] as 0

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