Calculate values of Ksp for the following sparingly soluble solutes. [Begin by w

Question

Calculate values of Ksp for the following sparingly soluble solutes. [Begin by writing solubility equilibrium expressions.]

A) Calculate value of Ksp for AgBr (Gf(Ag+)=77.11 kJmol1 , Gf(Br)=-104.0 kJmol1 , Gf(AgBr)=-96.90 kJmol1 ). Express your answer using two significant figures.

B) Calculate value of Ksp for PbSO4 (Gf(Pb2+)= -24.43 kJmol1 , Gf(SO42)=-744.5 kJmol1 , Gf(PbSO4)=-813.1 kJmol1 ). Express your answer using two significant figures.

C) Calculate value of Ksp for Ca(OH)2 (Gf(Ca2+)=-553.6 kJmol1 , Gf(OH)=-157.2 kJmol1 , Gf(Ca(OH)2)=-898.5 kJmol1 ). Express your answer using two significant figures.

Explanation / Answer

a.

G = Gprod - Greact = 77.11   -104.0 - -96.9 = 70.01 kJ

G = -RT*lnK

K = exp(-G/(RT)) = exp(-70010/(8.314*298)) = 5.34*10^-13

b.

G = Gprod - Greact = -24.43 -744.5 - -813.1 = 44.17kJ

G = -RT*lnK

K = exp(-G/(RT)) = exp(-44170/(8.314*298)) = 1.8089*10^-8

c.

G = Gprod - Greact = -553.6 -2*157.2 - -898.5 = 30.5kJ

G = -RT*lnK

K = exp(-G/(RT)) = exp(-30500/(8.314*298)) = 0.00000450447 = 4.5*10^-6

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