Can you explain in detail how to solve these? c) 1.6 x 10-3 d) 3.2x 103 e) 5.5 x

Question

Can you explain in detail how to solve these?

c) 1.6 x 10-3 d) 3.2x 103 e) 5.5 x 103 24.10 2 55) the molar solubility of CaF2 is 2.1 x 104 M, what is the value of Ksp? a) 2.1 x 1O4 b) 2.6 x 109 ? 3.7 x 10-11 d) 1.4 x 10-18 e) 5.4 x 10-27 . Solve for solubility when a common ion is present. 56) A polluted water source has a concentration of lead (Il) ion of 2.5 x 103M. To a 1.OL sample of the water 1.5 moles of Nal is added. What is the concentration of the lead in solution with the Nal? Ksp for Pblz 8.5 x 109 a) 3.8 x 10-9 M b) 4.6 x 10-M c) 5.1 x 107M d) 6.5 x 10-6M e) 7.3 x 10-SM

Explanation / Answer

55) CaF2 -----> Ca^2+(aq) + 2F^-(aq)

Ksp = s*(2s)^2 = 4s^3

Ksp of CaF2 = 4*(2.1*10^-4)^3

             = 3.7*10^-11


56) [Pb2+] = 2.5*10^-3 M

    [I-] = 1.5/1 = 1.5 M

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

solution with NaI , [I-] = 2S = 1.5 M

                      [Pb2+] = S = ?

    8.5*10^-9 = S*(1.5)^2

S = 3.8*10^-9 M

[Pb2+] = S = 3.8*10^-9 M

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