Question

A solution is 0.10 M Cl and 0.10 M I- . Silver nitrate is slowly added to precipitate the silver halide. Ksp(AgCl) = 1.77 x 10-10; Ksp(AgI) = 8.52 x 10-17

(A) Which solid will precipitate first?

(B) What will be the [Ag+ ] when the first solid begins to precipitate?

(C) What [Ag+ ] is required in order to precipitate AgCl?

(D) What will be the [I- ] when the AgCl starts to precipitate?

(E) What percentage of the iodide remains when the first AgCl precipitates?

Answer 1

[18] = 0.1M } - when Ag ng is slowly added then Agle and Ag I (10]= 0.1M J will get precipitate out as follows: Agle (s) ² Ag + (aq) + E (aq), (Ksp) ancew = 1.77X10 to. [Agt] [ce], 1.72 2 1.77 Xiu-lo Activity of Pecono solod - [Agus)] o c) Cagt? - Ksp/cal equined Ox in censidered to be unity to precipitate 0:1M ci- -1.99x15? Aq I s) Z. Age (aq) + I las), Kepor=8252410-17 (Ag +) CDC). 9.52x10-17 -(Ag I (s)] Activity of pure solid is [Ago (Ksejar considered to be unity recupotute ool 3.8752 x 10-17 share solid i Cory required to [20] IG 0:1 28.52x10-16 . (A) Ance Concentration of Agt required to precipitate oim zo in less than to precipitate o. in eo in, so Ag. I h) will - precipitate first. 1B) (Agt} = 8.52x106M when Ag I (finst toled) beguns to precipitate. (0) Cage for prewpitating = 1,77X10-9M ( in order to Port prealpitate e as Ay cassolid)). 0.1M ceo

. When Ag u start to precipitate, then [Age] 1,77x10lm Ag I (1) Z Agot I lag), Kole - 8,5281017 eg) , Ksp) AZ 852 1-79X15YM rno [1 When Aqce begins to precipitate Ksdag 2 my when Age begins Cayo to precipitate = 2.52x10-17 1.77X109 M ? 4,813x 70-8M (E) [I I remains - [1 when Agle begins to precipitate - - leff Xlos [II Initial 4,813 PABXlo- - Xloo 4,813 x10-% - Was HD Oil samen