Question

# For each of the salts on the left, match the salts on the right that can...

For each of the salts on the left, match the salts on the right that can be compared directly, using Ksp values, to estimate solubilities.

(If more than one salt on the right 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 sulfate A. BaF2 2. lead bromide B. Ag2SO3 C. CaCrO4 D. Pb(OH)2

Write the expression for K in terms of the solubility, s, for each salt, when dissolved in water.

Note: Multiply out any number and put it first in the Ksp expression. Combine all exponents for s.

**** 1 & 2 COULD HAVE MORE THAN 1 ANSWER *****

Solubility of AB, A2B, AB2, A3B, AB3, A2B3, A3B2

For solubility comparisson:

AB <-> A+ + B-; Ksp = [A+][B-] = S*S = S^2 --> S = sqrt(Ksp)

A2B <--> 2A+ + B-2 Ksp = [A+]^2[B-2] = (2S)^2 * S = 4*S^3 --> S = (Ksp/4)^(1/3)

AB2 <--> A+2 + 2B- ; Ksp = [A+2][B-]^2 = S* (2S)^2 = 4*S^3 --> S = (Ksp/4)^(1/3)

Now, substitute al Ksp values, and identifty molar solubilities:

Lead sulfate = PbSO4 = AB type

Lead Bromide = PbBr2 = AB2 type

BaF2 = AB2 type

Ag2SO3 = A2B type

CaCrO4 = AB type

Pb(OH)2 = AB2 type

then, recall that AB2 = A2B types

from the list

PbSO4 = CaCrO4 only

for

PbBr2 = (BaF2, Ag2SO3, Pb(OH)2))

Q2.

write Ksp

Ksp = [Pb2+][SO4-2]

Ksp [Pb2+][Br-]^2

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