Question

Which of the following statements is correct for a solution saturated with AgCl and AgBr if their solubilities in moles per litre in separate solutions are x and y respectively ?

• A. [Ag+] = x + y
• B. [Ag+] = [Br–] + [Cl–]
• C. [Br–] = y
• D. [Cl–] > x.

Answer 1

Answer: (B)

$Ag+$ = $Br–$ + $Cl–$

Answer 2

AgCI $\rightleftharpoons$ Ag+ + CI– AgBr $\rightleftharpoons$ Ag+ + Br–

x x y y

(x + y) x (x + y) y

So [Ag+] = [Br–] + [CI–]