Question

The K., of PbBr, is 6.60 x 10-6 What is the molar solubility of PbBr, in pure water? molar solubility: What is the molar solubility of PbBr, in 0.500 M KBr solution? molar solubility: What is the molar solubility of PbBr, in a 0.500 M Pb(NOx), solution? molar solubility:

Answer 1

The ky value of PbBrı is 6.60x100 At equilibrium, the molar solubility of ions is as follows: PbBiz (s) = Pb2+ (aq)+2Br" (aq) Initialy Dissociations S 2s Finally 1-s 2s 0 The equilibrium expression is given as follows: kop = [Pb2+ ][Br"] 6.60x100 = (s)(25) 6.60x10-6 = 45 s=1.18x102 M Hence, the molar solubility of PbBrı in pure water is 1.18x10-2 M.

In 0.500 M KBr solution, the molar solubility is given as follows: PbBrz (s) = Pb2+ (aq) + 2Br+ (aq) Initialy 0 0.5 Dissociations S 2s Finally s (0.5+ 2s) 1-5 Substitute the values in ken expression as follows: kop =[Pb2+ ][Br] 6.60x10-0 = (s)(0.500 +2s)? On solving for s, s = 2.64x10--M Hence, the molar solubility of PbBr, in 0.500 M KBr is 2.64*10- M.

In 0.500 M Pb(NO3), solution, the molar solubility is given as follows: PbBr, (s) – Pb2+ (aq) + 2Br - (aq) 1 0.5 0 Initialy Dissociation Finally 1-s (0.5+) 2s Substitute the values in kop expression as follows: kop = [Pb2+ ][Br-1 6.60x10-6 = (0.500+5)(25)? On solving for s, S = 1.82x10-M Hence, the molar solubility of PbBr; in 0.500 M Pb(NO3), is 1.82x10-² M.