Applying Keq to Ionic Solutions and Acids/Bases – Practice

Questions:

1) Write the solubility product for the dissolution of the following ionic compounds:

a) PbCl2

b) Mg(OH)2

c) Iron (III) hydroxide

 

2) Write the dissociation expressions for the following:

a) H2CO3

b) Zn(OH)2

 

3) Ammonia dissolves in water to form an alkaline solution. The equation for the reaction between ammonia and water is given:

NH3(aq) + H2O(l) ⇌ NH4+(aq) + OH−(aq)

Write the base dissociation constant expression for this reaction:

Quick Answers:

1a) { K }_{ sp }=[{ Pb }^{ 2+ }][{ Cl }^{ – }]^{ 2 }

1b) { K }_{ sp }=[{ Mg }^{ 2+ }][{ OH }^{ – }]^{ 2 }

1c) { K }_{ sp }=[{ Fe }^{ 3+ }][{ OH }^{ – }]^{ 3 }

2a) { K }_{ sp }=\cfrac { [H^{ + }]^{ 2 }[{ CO_{ 3 } }^{ 2- }] }{ { [H }_{ 2 }{ CO }_{ 3 }] }

2b) { K }_{ sp }=\cfrac { [Zn^{ 2+ }][{ OH }^{ – }]^{ 2 } }{ [Zn({ OH) }_{ 2 }] }

3. { K }_{ sp }=\cfrac { [NH_{ 4 }^{ + }][{ OH }^{ – }] }{ [NH_{ 3 }] }

Worked Answers: (coming soon)