CHM 130: Chapter 15 Homework Problems Key
1. Use your solubility rules to determine if the following compound is a strong or weak electrolyte:
Use your Solubility Rules. Soluble ionic compounds are strong electrolytes, and
insoluble ionic compounds are weak electrolytes.
a. PbSO4
strong electrolyte
weak electrolyte
b. Al2(SO4)3
strong electrolyte
weak electrolyte
c. SrI2
strong electrolyte
weak electrolyte
d. Cu(OH)2
strong electrolyte
weak electrolyte
e. K2CrO4
strong electrolyte
weak electrolyte
f. Ni(NO3)3
strong electrolyte
weak electrolyte
g
strong electrolyte
weak electrolyte
strong electrolyte
weak electrolyte
Ba(C2H3O2)2
h. Ca3(PO4)2
2. For the strong electrolytes, show the species present in solution when the substance dissolves in
water. For the weak electrolytes, indicate the ionic compound remaining solid.
O
a. PbSO4 "H
"2"#
PbSO4(s)
3+
2O
b. Al2(SO4)3 "H
"2"# 2 Al (aq) + 3 SO4 (aq)
2+
O
c. SrI2 "H
"2"# Sr (aq) + 2 I (aq)
O
d. Cu(OH)2 "H
"2"#
Cu(OH)2(s)
+
2O
e. K2CrO4 "H
"2"# 2 K (aq) + CrO4 (aq)
3+
O
f. Ni(NO3)3 "H
"2"# Ni (aq) +3 NO3 (aq)
2+
O
g. Ba(C2H3O2)2 "H
"2"# Ba (aq) + 2 C2H3O2 (aq)
O
h. Ca3(PO4)2 "H
"2"# Ca3(PO4)2(s)
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