Pl help Q 19
Dear student
AgI(s) <------------> Ag+(aq) + I-(aq) ---------------(1)
Ksp = [Ag+] [I-] = 1.2*10-17M2
Ag+(aq) + 2CN-(aq) <----------> [Ag(CN)2] -------------------(2)
Kf = [Ag(CN)2] / [Ag+] [CN-]2 = 7.1*1019
Let X = number of moles of AgI dissolved in CN- solution.
AgI(s) 2CN- <-------> [Ag(CN)2] + I-
1 0 0 (Initial moles before reaction)
2X X X (moles after reaction)
Keq = Ksp * Kf (from eqation 1 and 2)
Keq = 1.2*10-17 * 7.1*1019 = 8.52*102
= [Ag(CN)2] [I-] / (CN- )2 = X2/(1-2X)2
X/1-2X = 29.2
X = 29.2 - 58.4X
X = 0.49moles
Regards
AgI(s) <------------> Ag+(aq) + I-(aq) ---------------(1)
Ksp = [Ag+] [I-] = 1.2*10-17M2
Ag+(aq) + 2CN-(aq) <----------> [Ag(CN)2] -------------------(2)
Kf = [Ag(CN)2] / [Ag+] [CN-]2 = 7.1*1019
Let X = number of moles of AgI dissolved in CN- solution.
AgI(s) 2CN- <-------> [Ag(CN)2] + I-
1 0 0 (Initial moles before reaction)
2X X X (moles after reaction)
Keq = Ksp * Kf (from eqation 1 and 2)
Keq = 1.2*10-17 * 7.1*1019 = 8.52*102
= [Ag(CN)2] [I-] / (CN- )2 = X2/(1-2X)2
X/1-2X = 29.2
X = 29.2 - 58.4X
X = 0.49moles
Regards