Question

1. Complete the following [cation) (anion] Compound (a) Coco; (b) LaF; (c) Ba3(PO4h Ksp 1 x 10-10 2 x 10-19 6 X 10 - 19 7 x 10-6 4.2 x 10-8

Answer 1

a) [Cation] = [anion] = √(ksp) = √(1×10^-10) = 1×10^-5

b) Ksp(LaF3) = [La3+][F-]³

[cation] = Ksp/[Anion]³ = 2×10^-19/(7×10^-6)³

= 5.8×10^-4

c) Ksp(Ba3(PO4)2) = [Ba2+]³[PO4-]²

[Anion]² = Ksp/[cation]³ = 6×10^-39/(4.2×10^-8)³

[Anion]² = 8.1×10^-17

[Anion] = √(8.1×10^-17)

= 9×10^-9