Living by Chemistry
Living by Chemistry
2nd Edition
ISBN: 9781464142314
Author: Angelica M. Stacy
Publisher: W. H. Freeman
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Chapter U6.123, Problem 1TAI
Interpretation Introduction

Interpretation: Acid-base indicators work needs to be explained.

Concept Introduction: Acid-base indicators are substances that respond to a change in the H+ ion concentration of a solution. Acid-base indicators are usually weak acids, or weak bases. A weak acid is a compound that partly dissociates in solution, or breaks apart.

Expert Solution & Answer
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Answer to Problem 1TAI

Depending on pH of the solution acid-base indicator changes color.

Explanation of Solution

Acid-base indicators are weak acids or bases that change color depending on pH. The concentrations of an indicator molecule and its anion depend on the concentration of H+ ions in solution. Therefore, the color of an indicator is a measure of acidity of the solution. The color of an indicator changes when the concentrations of the HIn molecules and In anions are identical. This occurs when K = [H+] .

Conclusion

In an aqueous solution, a weak base or weak acid shows a color change as the concentration of H+ and OH ions changes.

Chapter U6 Solutions

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