Question

The Ksp for AgBr is 4.9 X 10^-13 at 25 C. What is the concentration of Ag+ in a solution in which the concentration of Br- is 0.010M?

Answer 1

Answer: The concentration of $Ag^+$ ion in the solution is $4.9\times 10^{-11}M$

Explanation:

The balanced equilibrium reaction for the ionization of calcium fluoride follows:

$AgBr\rightleftharpoons Ag^{+}+Br^-$

             s      0.01

The expression for solubility constant for this reaction will be:

$K_{sp}=[Ag^{+}][Br^-]$

We are given:

$K_{sp}=4.9\times 10^{-13}$

$[Br^-]=0.01M$

Putting values in above equation, we get:

$4.9\times 10^{-13}=(s)\times 0.01$

$[Ag^+]=4.9\times 10^{-11}M$

Hence, the concentration of $Ag^+$ ion in the solution is $4.9\times 10^{-11}M$