PLEASE ANSWER ALL IF POSSIBLE 1) Write the K sp expression for the sparingly sol

Question

PLEASE ANSWER ALL IF POSSIBLE

1) Write the Ksp expression for the sparingly soluble compound cobalt(II) carbonate,CoCO3. If either the numerator or denominator is 1, please enter 1.

2)A student measures the OH- concentration in a saturated aqueous solution of cobalt(II) hydroxide to be 7.75×10-6 M.  
Based on her data, the solubility product constant for cobalt(II) hydroxide is______

3)A student measures the molar solubility of silver carbonate in a water solution to be 1.29×10-4 M.  
Based on her data, the solubility product constant for this compound is_________

Explanation / Answer

1)

CoCO3 Co2+ + CO32-
1 mole 1 mole + 1 mole
x moles x moles + x moles

Ksp = [Co2+][CO32-]
Ksp = 1.0 × 10-10 = (x)(x) = x2
x = (1.0 × 10-10)½
x = 1 x 10-5 M

2) Ksp  = (x)(x) = (7.75×10-6 M)2 = 0.6 x 10-10

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