Question

计算400ml0.50mol•L Na2S2O3溶液可溶解多少克固体AgBr?

Answer 1

AgBr + 2S2O32- =[Ag(S2O3)2]3- + Br-

K=KspAgBr * K稳定=5.0*10^-13*10^13.46=14.42

AgBr + 2S2O32- =[Ag(S2O3)2]3- + Br-

0.5-2x x x

K=x*x /(0.5-2x)^2 =14.42

x=0.22mol/L

溶解固体n(AgBr)=n(Br-)=0.22mol/L*0.400L=0.088mol

质量=0.088mol *188g/mol=16.6g