Living By Chemistry: First Edition Textbook
Living By Chemistry: First Edition Textbook
1st Edition
ISBN: 9781559539418
Author: Angelica Stacy
Publisher: MAC HIGHER
Question
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Chapter U6.7, Problem 5E

(a)

Interpretation Introduction

Interpretation: Color of alizarin yellow when dissolved in water needs to be explained.

Concept Introduction: The concepts of Le Chatelier principle is also known as the Equilibrium law, are used to illustrate the effect of such changes on a chemical equilibrium. According to him, equilibrium adjusts the forward and backward reactions to acquire the changes which alter the conditions of equilibrium.

(a)

Expert Solution
Check Mark

Answer to Problem 5E

Color of indicator is red.

Explanation of Solution

When an indicator is dissolved in water it dissociates as given below

  HIn(aq)+H2O(l)H3O+(aq)+In(aq)

The acid and its conjugate base have different colors. At low pH values concentration of H3O+ is high and so the equilibrium shift towards left and color of the solution is same as HIn . At high pH values, the concentration of H3O+ is low. Thus equilibrium shift to the right and the solution has the color of In . Therefore, from table color of In is red.

(b)

Interpretation Introduction

Interpretation: Color of bromocresol green when dissolved in water needs to be explained.

Concept Introduction: The concepts of Le Chatelier principle is also known as the Equilibrium law, are used to illustrate the effect of such changes on a chemical equilibrium. According to him, equilibrium adjusts the forward and backward reactions to acquire the changes which alter the conditions of equilibrium.

(b)

Expert Solution
Check Mark

Answer to Problem 5E

Color of bromocresol green indicator is blue.

Explanation of Solution

When an indicator is dissolved in water it dissociates as given below

  HIn(aq)+H2O(l)H3O+(aq)+In(aq)

The acid and its conjugate base have different colors. At low pH values the concentration of H3O+ is high and so the equilibrium position shift towards left and the color of the solution is same as HIn . At high pH values, the concentration of H3O+ is low. Thus equilibrium shift to the right and the solution has the color of In . Therefore, from table color of In is blue.

(c)

Interpretation Introduction

Interpretation: Color of methyl red when dissolved in water needs to be explained.

Concept Introduction: The concepts of Le Chatelier principle is also known as the Equilibrium law, are used to illustrate the effect of such changes on a chemical equilibrium. According to him, equilibrium adjusts the forward and backward reactions to acquire the changes which alter the conditions of equilibrium.

(c)

Expert Solution
Check Mark

Answer to Problem 5E

Color of methyl red indicator is yellow.

Explanation of Solution

When an indicator is dissolved in water it dissociates as given below

  HIn(aq)+H2O(l)H3O+(aq)+In(aq)

The acid and its conjugate base have different colors. At low pH values the concentration of H3O+ is high and so the equilibrium position shift towards left and color of the solution is same as HIn . At high pH values, the concentration of H3O+ is low. Thus equilibrium shift to the right and the solution has the color of In . Therefore, from the table color of In is yellow.

(d)

Interpretation Introduction

Interpretation: Color of phenol red when dissolved in water needs to be explained.

Concept Introduction: The concepts of Le Chatelier principle is also known as the Equilibrium law, are used to illustrate the effect of such changes on a chemical equilibrium. According to him, equilibrium adjusts the forward and backward reactions to acquire the changes which alter the conditions of equilibrium.

(d)

Expert Solution
Check Mark

Answer to Problem 5E

Color of phenol red indicator is red.

Explanation of Solution

When an indicator is dissolved in water it dissociates as given below

  HIn(aq)+H2O(l)H3O+(aq)+In(aq)

The acid and its conjugate base have different colors. At low pH values the concentration of H3O+ is high and so the equilibrium shift towards the left and color of the solution is same as HIn . At high pH values, the concentration of H3O+ is low. Thus equilibrium shift to the right and the solution has the color of In . Therefore, from table color of In is red.

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