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A) What is the K sp expression for Pb(CO 3 ) 2 ? K sp = [Pb 2+ ][CO 3 - ] 2 K sp

ID: 880599 • Letter: A

Question

A)

What is the Ksp expression for Pb(CO3)2?

Ksp = [Pb2+][CO3-]2

Ksp = [Pb2+][2CO3-]2

Ksp = [Pb4+][CO32-]2

Ksp = [Pb][CO3]2

B)

Based on the acid/base properties of the salt, do you expect each of the following to be more soluble in acid, more soluble in base, or no effect of pH on solubility?

CaSO4

NH4Cl

KBr

BaCO3

Little or no effect of pH on solubility

More soluble in acidic solutions.

More soluble in basic solutions

Ksp = [Pb2+][CO3-]2

Ksp = [Pb2+][2CO3-]2

Ksp = [Pb4+][CO32-]2

Ksp = [Pb][CO3]2

B)

Based on the acid/base properties of the salt, do you expect each of the following to be more soluble in acid, more soluble in base, or no effect of pH on solubility?

CaSO4

NH4Cl

KBr

BaCO3

A.

Little or no effect of pH on solubility

B.

More soluble in acidic solutions.

C.

More soluble in basic solutions

Explanation / Answer

Solution

A)Pb(CO3)2 ksp equation = ?

Dissociation of the Pb(CO302 is as follows

Pb(CO3)2 ------ > Pb^4+   + 2CO3^2-

Therefore while writng the ksp equation we only use the ion concnetrations

Therefore ksp equation is as follows

Ksp = [Pb^4+][CO3^2-]2

B)Solubility of the salts

CaSO4 = Little or no effect of pH on solubility

NH4Cl =more soluble in basic solution.

KBr= Little or no effect of pH on solubility

BaCO3 = more soluble in acidic solution (because it will form H2CO3 acid which unstable so decompose to give CO2 and H2O)

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