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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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. Consider the equation: HA ( aq ) + H 2 O H 3 O + ( aq ) + A ( aq ) . a. If water is a better base than A-, which way will equilibrium lie?

b. If water is a better base than A-, does this mean that HA is a strong or a weak acid?

c. If water is a better base than A-, is the value for Kagreater or less than 1?

Interpretation Introduction

(a)

Interpretation:

Considering the equation: HA(aq)+ H2OH3O+(aq)+ A-(aq), if water is a better base than A-, which way will equilibrium lie should be discussed.

Concept Introduction:

When an acid dissolves in water, a proton is transferred from the acid to water.

HA(aq)+H2O(l)H3O+(aq)+A-(aq)

In this reaction conjugate acid H3 O+ and conjugate base A- is produced. This conjugate acid and conjugate base can react with each other.

H3O+(aq)+A-(aq)HA(aq)+H2O(l)

This reaction reforms the acid and water.

Therefore the reaction can occur in both directions; Forward and reverse directions.

HA(aq)+ H2OH3O+(aq)+ A-(aq)

Products of the forward reaction are the reactants of reverse reaction.

Explanation

This situation represents a competition for H+ ions between H2 O in the forward reaction and A- in the reverse reaction...

Interpretation Introduction

(b)

Interpretation:

Considering the equation: HA(aq)+ H2OH3O+(aq)+ A-(aq), if water is a better base than A-, whether HA is a strong acid or a weak acid should be discussed.

Concept Introduction:

When an acid dissolves in water, a proton is transferred from the acid to water.

HA(aq)+H2O(l)H3O+(aq)+A-(aq)

In this reaction conjugate acid H3 O+ and conjugate base A- is produced. This conjugate acid and conjugate base can react with each other.

H3O+(aq)+A-(aq)HA(aq)+H2O(l)

This reaction reforms the acid and water.

Therefore the reaction can occur in both directions; Forward and reverse directions.

HA(aq)+ H2OH3O+(aq)+ A-(aq)

Products of the forward reaction are the reactants of reverse reaction.

Strong acids are acids which completely dissociate or ionize in an aqueous solution. Weak acids are acids which partially dissociate or ionize in an aqueous solution.

Interpretation Introduction

(c)

Interpretation:

Considering the equation: HA(aq)+ H2OH3O+(aq)+ A-(aq), whether the value for Ka is greater or less than one should be discussed.

Concept Introduction:

Acid dissociation constant, Ka is a quantitative measure of strength of an acid.

Ka=[H3O+(aq)][A-(aq)][HA(aq)]

When Ka is high, strength of the acid is high.

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Ch-16 P-2ALQCh-16 P-3ALQCh-16 P-4ALQCh-16 P-5ALQCh-16 P-6ALQCh-16 P-7ALQCh-16 P-8ALQCh-16 P-9ALQCh-16 P-10ALQCh-16 P-11ALQCh-16 P-12ALQCh-16 P-13ALQCh-16 P-14ALQCh-16 P-15ALQCh-16 P-16ALQCh-16 P-17ALQCh-16 P-1QAPCh-16 P-2QAPCh-16 P-3QAPCh-16 P-4QAPCh-16 P-5QAPCh-16 P-6QAPCh-16 P-7QAPCh-16 P-8QAPCh-16 P-9QAPCh-16 P-10QAPCh-16 P-11QAPCh-16 P-12QAPCh-16 P-13QAPCh-16 P-14QAPCh-16 P-15QAPCh-16 P-16QAPCh-16 P-17QAPCh-16 P-18QAPCh-16 P-19QAPCh-16 P-20QAPCh-16 P-21QAPCh-16 P-22QAPCh-16 P-23QAPCh-16 P-24QAPCh-16 P-25QAPCh-16 P-26QAPCh-16 P-27QAPCh-16 P-28QAPCh-16 P-29QAPCh-16 P-30QAPCh-16 P-31QAPCh-16 P-32QAPCh-16 P-33QAPCh-16 P-34QAPCh-16 P-35QAPCh-16 P-36QAPCh-16 P-37QAPCh-16 P-38QAPCh-16 P-39QAPCh-16 P-40QAPCh-16 P-41QAPCh-16 P-42QAPCh-16 P-43QAPCh-16 P-44QAPCh-16 P-45QAPCh-16 P-46QAPCh-16 P-47QAPCh-16 P-48QAPCh-16 P-49QAPCh-16 P-50QAPCh-16 P-51QAPCh-16 P-52QAPCh-16 P-53QAPCh-16 P-54QAPCh-16 P-55QAPCh-16 P-56QAPCh-16 P-57QAPCh-16 P-58QAPCh-16 P-59QAPCh-16 P-60QAPCh-16 P-61QAPCh-16 P-62QAPCh-16 P-63QAPCh-16 P-64QAPCh-16 P-65APCh-16 P-66APCh-16 P-67APCh-16 P-68APCh-16 P-69APCh-16 P-70APCh-16 P-71APCh-16 P-72APCh-16 P-73APCh-16 P-74APCh-16 P-75APCh-16 P-76APCh-16 P-77APCh-16 P-78APCh-16 P-79APCh-16 P-80APCh-16 P-81APCh-16 P-82APCh-16 P-83APCh-16 P-84APCh-16 P-85APCh-16 P-86APCh-16 P-87APCh-16 P-88APCh-16 P-89APCh-16 P-90APCh-16 P-91APCh-16 P-92APCh-16 P-93APCh-16 P-94APCh-16 P-95APCh-16 P-96APCh-16 P-97APCh-16 P-98APCh-16 P-99APCh-16 P-100APCh-16 P-101APCh-16 P-102APCh-16 P-103APCh-16 P-104APCh-16 P-105APCh-16 P-106CPCh-16 P-107CPCh-16 P-108CP

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