ANSWER

1. CaF ₂  ---- Ca²⁺ + F^-

s                 s         2s

Ksp = (Ca²⁺)(F^-)²

= s . (2s)² = 4s³

Jurus super Cepat:

Ksp = XX . YY. (S)^X+Y

= 11 . 22 . (S)¹⁺² = 4s³

2. Ag2crO4 ---- 2Ag^{2+} + CrO^-

S                  2s          s

Ksp       = (Ag+)2(CrO4-2)

4.10-12 = (2s)2(s)

4.10-12 = 4s3

10-12 = s3

S      = 10-4(CrO4-2) = s=10-4

Jurus super Cepat:

(S) = \sqrt[x+y]{\frac{Ksp}{X^x . Y^y}}

(S) = \sqrt[2+1]{\frac{4 . 10^{-12}}{2^2 . 1^1}}

= 10^{-4}

3. A.    AgBr

Ag⁺ + Br^-                            AgBr

Ksp AgBr = [Ag⁺] [Br^-]

B.     Ag₂CO₃

 Ag⁺ + CO^3-                      Ag₂CO₃

Ksp Ag2CO3 = [Ag⁺]² [CO^3-]

C.     PbI₂

Pb²⁺ + 2 I^-                         

Ksp PbI₂ = [Pb²⁺] [I^-]²

D.     Ba₃(PO₄)₂

Ba²⁺ + 2 PO₄^3-

Ksp Ba₃(PO₄)₂ = [Ba₂⁺]³ [PO₄^3-]²

4. Ag₂CO₃

2 Ag⁺  +  CO^{3-             --------}     Ag₂CO₃

S             2S                 S

Ksp Ag₂CO₃ = [Ag⁺]² [CO^3-]

2,4 x 10^–12 = (2s)² (s)

2,4 x 10^–12 = 4s³

s³ = 0,6 x 10^–12

s = 8,4 x 10^–5