Rank the following salts from least to most molar solubility:
BiI Ksp = 7.7x10-19
Cd3(AsO4)2 Ksp = 2.2x10-33
AlPO4 Ksp = 9.8x10-21
CaSO4 Ksp = 4.9x10-5
a)Cd3(AsO4)2 < BiI < AlPO4 < CaSO4
b) AlPO4 < BiI < Cd3(AsO4)2 < CaSO4
c) Cd3(AsO4)2 < AlPO4 < BiI < CaSO4
d) CaSO4 < BiI < AlPO4 < Cd3(AsO4)2
Answer: b) AlPO4 < BiI < Cd3(AsO4)2 < CaSO4