Question
Asked Mar 23, 2020
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Which one of the compounds below has the highest solubility in water, expressed in moles per liter? a. ZnCO3, Ksp = 1.4 × 10–11 b. Cd(OH)2, Ksp = 2.4 × 10–14 c. AgI, Ksp = 8.3 × 10–17 d. CdCO3, Ksp = 5.2 × 10–12

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Expert Answer

Introduction:

On dissolving any component in solution, results the establishment of equilibrium among dissociated and non-dissociated ions. This solubility or dissociated ion amount is estimated by its solubility product. If Ksp is high then the compound is highly soluble in the solution. 

Given:

Chemistry homework question answer, step 1, image 1

Calculations and Explanation:

Zinc carbonate dissociates into ions as shown below.

Chemistry homework question answer, step 2, image 1

Here,

The solubility of zinc carbonate is “s”.

The solubility of zinc carbonate is calculated as follows,

Chemistry homework question answer, step 2, image 2

Substitute the known values in the formula.

Chemistry homework question answer, step 2, image 3

Chemistry homework question answer, step 2, image 4

Cadmium hydroxide dissociates in ions as shown below.

Chemistry homework question answer, step 2, image 5

Similarly, the solubility of cadmium hydroxide is calculated as follows,

Chemistry homework question answer, step 2, image 6

Chemistry homework question answer, step 2, image 7

The dissociation of silver iodide is shown below.

Chemistry homework question answer, step 2, image 8

The solubility of AgI is calculated as follows,

Chemistry homework question answer, step 2, image 9

Chemistry homework question answer, step 2, image 10

Cadmium carbonate dissociates as shown below.

Chemistry homework question answer, step 2, image 11

The solubility of cadmium carbonate is calculated as follows,

Chemistry homework question answer, step 2, image 12

Chemistry homework question answer, step 2, image 13

Chemistry homework question answer, step 2, image 14

 

 

 

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