If 450 mL of i 1 times M AgNO_3, is mixed with 450 mL of 1 times 10^-2 M Nal. wh

Question

If 450 mL of i 1 times M AgNO_3, is mixed with 450 mL of 1 times 10^-2 M Nal. what will occur? For Agl. K = -8.3 times 10^12. A) Silver(T) iodide will precipitate. B) No precipitate will form. C) Sodium nitrate will precipitate. D) silver(I) nitrate will precipitate. E) Sodium iodide will precipitate. Sodium chloride is added slowly to a solution that is 0.010 M in Cu^+, Ag^+ and Au^+ .The K values for the chloride salts are 1.9 times 10^-7, .1.6 times 10^-10, and 2.0 times 10^-13, respectively. Which compound will precipitate first? A) CuCl(s) B) AgCl(s) C) AuCl(s) D) All will precipitate at the same time. E) It cannot be determined.

Explanation / Answer

10)

AgI <=======> Ag+(aq) + I-(aq)

Ksp = [Ag+][I-]

Ksp = 8.3 x 10^-17

Ionic product =  [Ag+][I-] = 1.0x 10^-7 x 1x 10^-8 = 1x10^-15

So, ionic product is more than Ksp.

Therefore, silver (I) iodide precipitates.

11) C

Lower the value of Ksp, the first will be precipitation occurs.

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