For each of the salts #1 and #2, match the salts A,B,C,D that can be compared di

Question

For each of the salts #1 and #2, match the salts A,B,C,D that can be compared directly, using Ksp values, to estimate solubilities.

(If more than one salt can be directly compared, include all the relevant salts by writing your answer as a string of characters without punctuation, e.g, ABC.)

1. Lead Sufide

2. Calcium Phosphate

A. Pb3(PO4)2

B. Cr(OH)3

C. CaSO3

D.CoCO3

Ksp lead sulfide _________Write the expression for K in terms of the solubility, s, for each salt, when dissolved in water.

Ksp calcium phosphate _________

Explanation / Answer

Ksp (PbS) = 3*10^-28

PbS <==> Pb^2+ + S^2-

Ksp = [Pb^2+][S^2-]

or, 3*10^-28 = s*s

or, s = 1.73*10^-14 M

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Ca3(PO4)2 <==> 3Ca^2+ +    2PO4^3-

Ksp = 2.07×10-33

Ksp = [Ca^2+]^3 * [PO4^3-]^2

or, 2.07×10-33 = (3s)^3 * (2s)^2

or, 2.07×10-33 = 108s^5

or, s = 1.14*10^-7 M

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1 matches with C and D

2 matches with A

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