The Following Equilibrium applies to the next 3 questions Ag2CO3(s) 2Ag+(aq) + C

Question

The Following Equilibrium applies to the next 3 questions Ag2CO3(s) 2Ag+(aq) + CO32–(aq) Ksp = 8.1 x 10–126.

What is the equilibrium concentration of Ag+(aq)?

A.5.40 x 10–12 M B.1.27 x 10-4 M C.2.53 x 10-4 M D.6.33 x 10 -5 M E.8.10 x 10–12 M

7.What is the equilibrium concentration of CO32-(aq)?

A.2.70 x 10–12 M B.1.27 x 10-4 M C.2.53 x 10 -4 M D.6.33 x 10 -5 M E.8.10 x 10–12 M

8.When Ag2CO3(s) is added to a solution containing 0.0200 M Na2CO3(aq), what is the equilibrium concentration of Ag+(aq)?

A.1.01 x 10-10 M B.4.04 x 10 -5 M C.1.01 x 10-5 M D.2.01 x 10-5 M E.0.200 M

I dont know how to start these problems.

Explanation / Answer

Ksp = [Ag+]^2[CO3-2]

Ksp = (2S)^2(S)

4s^3 = Ksp

s = (Ksp/4)^1/3 = ((8.1*10^-12)/4)^(1/3) = 1.2651*10^-4

[Ag+] = 2*S = 2*1.2651*10^-4

[Ag+] =2.530*10^-4

choose C

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