Equilibrium Question 883
Question: Silver ions are added to solution with $ [B{r^{-}}]=[C{l^{-}}]=[CO_3^{2-}]=[AsO_4^{3-}]=0.1,M $ . Which compound will precipitate at lowest $ [A{g^{+}}] $ -
Options:
A) $ AgBr(K _{sp}=5\times {10^{-13}}) $
B) $ AgCl(K _{sp}=1.8\times {10^{-10}}) $
C) $ Ag_2CO_3(K _{sp}=8\times {10^{-12}}) $
D) $ Ag_3AsO_4(K _{sp}={10^{-22}}) $
Show Answer
Answer:
Correct Answer: A
Solution:
$ [A{g^{+}}] $ required for precipitation of various salts are $ AgBr=7.07\times {10^{-8}},AgCl=1.3\times {10^{-5}}; $
$ Ag_2CO_3=1.26\times {10^{-4}};Ag_3AsO_4=1.38\times {10^{-6}} $
