At what molar [H3O+] will PbS just start to precipitate from a solution consisting of 1.592e-6...

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At what molar [H3O+] will PbS just start to precipitate from asolution consisting of 1.592e-6 M Pb(NO3)2 in 0.100 M H2S (satd)?H2S is bubbled through the solution to keep its concentrationconstant.
PbS(s) â†” Pb2+ (aq) + S2- (aq) Ksp = 2.51e-27
H2S(aq) â†” 2H+ (aq) + S2- (aq) K = 1.1x10-20

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3.9 Ratings (555 Votes)

when ionic product just cross the solubility product then precipitation start. here concentration of Pb ²⁺ 1.592e-6 M, optium S2- concentration require = Ksp / [Pb 2+]

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â =Â Â 2.51e-27 / 1.592e-6 M

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 1.1 * 10^-9M

now dissocation os H₂S

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â H2S(aq) â†” 2H+ (aq) + S2- (aq) K = 1.1x10-20

K = [H+ (aq)]² [S2- (aq)] / [H2S(aq)]

[H+ (aq)]2 = ( 1.1x10-20 *0 .1 ) / 1.1 * 10^-9 = 10^-12

[H3O+] = 10^-6 M

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