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Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

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BuyFindarrow_forward

Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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. The “Chemistry in Focus” segment Garden-Variety Acid— Base Indicators discusses acid-base indicators found in nature. What colors are exhibited by red cabbage juice under acid conditions? Under basic conditions?

Interpretation Introduction

Interpretation:The colors that are shown by the red cabbage juice under acidic and basic conditions.

Concept introduction:

Acid-base indicators are generally weak acids or weak bases which upon change of the H+ concentration or preferentially the pH of the medium can show distinct colors. These are used in titrimetric analysis to detect the end-point of an acid-base, oxidation-reduction, and EDTA titrations. Other than synthetic indicators, natural indicators are also available which has the capability of showing distinct colors at various pH values.

Explanation

The pH value of a solution can be determined using indicators, indicator papers and pH meter.Any acid base indicator is a weak acid or a weak base.They show colour below a certain pH value and another colour above a certain pH value. Consider acid-base indicator as weak acid which can be represented as HIn which takes part in the following equilibrium.

  HIn(aq) + H2O (aq) H3O+(aq) + In(aq)Color I                                                  Color II

Instead of Kathe equilibrium is described by KIn to show that the indicator is used.

  At equlibrium;KIn  =  [H3O+ (aq)][In-

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