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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