Question

Consider these compounds: A. Mg(OH)2 B. BaSO4 C. Zn(OH)2 D. CaCO3 Complete the following statements by...

Consider these compounds:

A. Mg(OH)2
B. BaSO4
C. Zn(OH)2
D. CaCO3

Complete the following statements by entering the letter corresponding to the correct compound.

Without doing any calculations it is possible to determine that manganese(II) hydroxide is more soluble than _____ , and manganese(II) hydroxide is less soluble than _____.

It is not possible to determine whether manganese(II) hydroxide is more or less soluble than _______ by simply comparing Ksp values.

Homework Answers

Answer #1

We can only compare

Mn(OH)2 --> AB2 type

which is Zn(OH)2 only

therefore

we can only use Ksp to compare solubility with Zn(OH)2

for BaSO4 and CaCO3 , we will need to perform calcualtion of Solubility:

For instnace:

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)

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