The answers are in bold, please EXPLAIN how to get the answer!! 10. A saturated

Question

The answers are in bold, please EXPLAIN how to get the answer!!

10. A saturated solution of magnesium fluoride has a concentration of 1.17 × 10-3 M. For this compound, Ksp =

A) 1.17 × 10-3

B) (1.17 × 10-3)2

C) 4(1.17 × 10-3)3

D) (1.17 × 10-3)3

E) 3(1.17 × 10-3)3

11. What is the molar solubility of PbI2 (Ksp = 7.1 × 10-9) in 0.10 M Pb(NO3)2?

A) 1.3 × 10-4 M

B) 2.6 × 10-3 M

C) 7.1 × 10-8 M

D) 2.7 × 10-4 M

E) 2.7 × 10-5 M

12. Which of the following solid salts is more soluble in 1.0 M H+ than in pure water?

a)       NaCl

b)       KI

c)        FePO4

d)       AgBr

e)        KNO3

The answers are in bold, please EXPLAIN how to get the answer!!

Explanation / Answer

concentration = solubility = 1.17*10^(-3) M

MgF2(aq) -----> Mg2+(aq) + 2F-(aq)

ksp of MgF2 = S*(2S)^2

          = (1.17*10^(-3)*(1.17*10^(-3)*2)^2)

    = 4*(1.17*10^(-3))^3

answer: C

11.

ksp of PbI2 = s*(2s)^2

(7.1*10^(-9)) = (0.1*(2s)^2)

Solubility s = 1.33*10^-4 M

12.

because FePO4 is basic in nature.so that it is readily soluble in acidic medfium.

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