Calculate values of Ksp for the following sparingly soluble solutes. A) Calculat

Question

Calculate values of Ksp for the following sparingly soluble solutes.

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. Ksp =

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. Ksp =

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. Ksp =

Explanation / Answer

G = -RT*ln(Ksp)

Ksp = exp(-G/(RT))

A

G = Gprod - Greact = 77.11 - 104 - -96.9 = 70.01 kJ/mol = 70010

Ksp = exp(-G/(RT))

Ksp = exp(-70010/(8.314*298)) = 5.34468*10^-13

b.

G = Gprod - Greact =-24.43-744.5 + 813.1 = 44.17 kJ/mol

Ksp = exp(-G/(RT))

Ksp = exp(-44170/(8.314*298)) = 1.80894*10^-8

c.

G = Gprod - Greact =-553.6 -2*157.2 + 898.5 = 30.5 kJ = 30500 J/mol

Ksp = exp(-G/(RT))

Ksp = exp(-30500 /(8.314*298))

Ksp = 0.00000450447

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