   # The active ingredient of Pepto-Bismol is the compound bismuth subsalicylate, which undergoes the following dissociation when added to water: C 7 H 5 BiO 4 ( s ) + H 2 O( l ) ⇌ C 7 H 4 O 3 2 − ( a q ) + Bi 3+ ( a q ) + OH − ( a q ) K = ? If the maximum amount of bismuth subsalicylate that reacts by this reaction is 3.2 × 10 −19 mol/L, calculate the equilibrium constant for the preceding reaction. ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

#### Solutions

Chapter
Section ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 15, Problem 84AE
Textbook Problem
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## The active ingredient of Pepto-Bismol is the compound bismuth subsalicylate, which undergoes the following dissociation when added to water: C 7 H 5   BiO 4 ( s )   +   H 2 O( l )   ⇌   C 7 H 4 O 3 2 − ( a q )   +   Bi 3+ ( a q )   +   OH − ( a q ) K   =   ? If the maximum amount of bismuth subsalicylate that reacts by this reaction is 3.2 × 10−19 mol/L, calculate the equilibrium constant for the preceding reaction.

Interpretation Introduction

Interpretation: The compound bismuth subsalicylate is given to be the active ingredient of Pepto-Bismol. The dissociation reaction of bismuth subsalicylate and the maximum amount of bismuth subsalicylate that reacts by this reaction is 3.2×1019mol/L . The equilibrium constant value for the preceding reaction is to be calculated.

Concept introduction: At equilibrium, the equilibrium constant expression is expressed by the formula,

K=ConcentrationofproductsConcentrationofreactants

### Explanation of Solution

Explanation

To determine: The equilibrium constant value for the preceding reaction.

The dissociation reaction that takes place is,

C7H5BiO4(s)+H2O(l)C7H4O3(aq)+Bi3+(aq)+OH(aq)

The dissociation reaction that takes place is,

C7H5BiO4(s)+H2O(l)C7H4O3(aq)+Bi3+(aq)+OH(aq)

It is assumed that complete dissociation of the given compound, bismuth subsalicylate, takes place.

The ions formed are in the ratio 1:1:1 .

Therefore,

The [C7H4O3] is 3.2×1019mol/L .

The [Bi3+] is 3.2×1019mol/L .

The [OH] is 3.2×1019mol/L

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