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# Calculate the molar solubility of CuS. How many grams of ISBN: 9780321910295 34

## Solution for problem 97P Chapter 15

Introductory Chemistry | 5th Edition

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Problem 97P

Calculate the molar solubility of CuS. How many grams of CuS are present in 15.0 L of a saturated CuS solution?

Step-by-Step Solution:

Step 1</p>

Solubility equilibrium expression for CuS (s) Cu +2 (aq) + S -2 (aq).

Solubility product constant expression :

Ksp = [Cu+2][S-2]

=1.27 * 10-36 .

Dissolution of 1 mol of CuS produces 1 mole of Cu+2  and 1 mol of S-2 at equilibrium

1 mol CuS = 1 mol Cu+2

1 mol CuS  = 1 mol of S-2.

Molar solubility of Cu+2  at equilibrium ,[Cu+2 ]= S

Molar solubility of S -2. at equilibrium ,[S-2 ]= S.

Solubility product constant ,Ksp = [Cu+2][S-2]

=S*S =S2.

Therefore ,S = = =1.3*10-18 M.

Hence molar solubility of CuS is 1.3*10-18 M.

Step 2 of 2

##### ISBN: 9780321910295

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