Living By Chemistry: First Edition Textbook
Living By Chemistry: First Edition Textbook
1st Edition
ISBN: 9781559539418
Author: Angelica Stacy
Publisher: MAC HIGHER
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Chapter U6.7, Problem 4E

(a)

Interpretation Introduction

Interpretation :

The value of Ka of HF must be determined.

Concept Introduction :

Acid dissociation constant (Ka) is small for weak acid. It is the ratio of concentration of products to reactants.

For a weak acid HA, Ka can be written as

  Ka=[H+][A-][HA] , where [H+], [A-] and [HA] are concentrations of proton, counter anion and the acid respectively.

(a)

Expert Solution
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Answer to Problem 4E

Ka for HF is 6.94×105.

Explanation of Solution

  Ka=[H+][A-][HA]=[2.6×103][2.6×103]0.0974=6.76×1060.0974=6.94×105.

b)

Interpretation Introduction

Interpretation :

The value of Ka for HNO3 is large must be shown.

Concept Introduction :

Strong acid undergoes complete dissociation.

b)

Expert Solution
Check Mark

Answer to Problem 4E

The Ka of HNO3 is infinite.

Explanation of Solution

  Ka=[H+][NO3-][HNO3]=[0.10][0.10][0]=

c)

Interpretation Introduction

Interpretation :

The stronger acid from HF or HNO3 must be determined.

Concept Introduction :

A strong acid undergoes complete dissociation whereas a weak acid undergo partial dissociation.

c)

Expert Solution
Check Mark

Answer to Problem 4E

HNO3 is stronger acid.

Explanation of Solution

HNO3 has acid dissociation constant very large which is infinite.

HF is weaker acid as acid dissociation constant is very less which is 6.94×105.

d)

Interpretation Introduction

Interpretation :

The solution with higher concentration of H+(aq) 0.10 M HF or 0.10 M HOCl must be explained.

Concept Introduction :

An acid will produce more H+ in aqueous solution which has greater Ka value.

d)

Expert Solution
Check Mark

Answer to Problem 4E

0.10 M HF solution has higher concentration of H+(aq).

Explanation of Solution

HF has acid dissociation constant 6.94×105.

HOCl has acid dissociation constant 2.8×108.

Thus HF will furnish more H+ in aqueous solution.

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