Concentation of Silver ions??

Question

What is the concentration of silver ions in a saturated solution of silver bromide(AgBr)?.The Ksp of silver bromide is 3.3*10^-13

[a] 5.7*10^-7

[b] 4.3*10^-5

[c] 3.3*10^-13

[d] 7.0*10^-5

[e] None of the above

Answer 1

AgBr -->  Ag+  &  Br-

K = [ Ag+]  [Br-]

3.3 e-13 = [ x]  [x]

x = 5.7 e-7

your answer is :

[a] 5.7*10^-7