17 Question ( point) e See page 753 A basic solution contains the iodide and pho

Question

17 Question ( point) e See page 753 A basic solution contains the iodide and phosphate ions that are to be separated via selective precipitation. The I concentration, which is 8.80x10-5 M, is 10,000 times less than that of the PO43-ion at 0.880 M. A solution containing the silver(I) ion is slowly added. Answer the questions below. Ksp of Agl is 8.30x1017 and of Ag3PO4, 8.90x1017 2nd attempt Part 1 (0.3 point) See Periodic Table Q See Hint Calculate the minimum Ag concentration required to cause precipitation of Agl. x10 mol/L Part 2 (0.3 point) Calculate the minimum Ag concentration required to cause precipitation of Ag3PO4 x 10mol/L

Explanation / Answer

a)

Ksp = [AG+][I-]

8.3*10^-17 = ([Ag+])(8.8*10^-5)

[Ag+] = (8.3*10^-17) / (8.8*10^-5)

[Ag+] = 9.431*10^-13 M

b)

Ksp = [Ag+]^3[PO4-3]

8.9*10^-17 = ([Ag+])^3 * (0.88)

[Ag+] = ((8.9*10^-17)/(0.88)) )^(1/3)

[Ag+] = 0.0000046 M

[Ag+] = 4.66*10^-6 M

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