In a saturated solution of the salt MX, the concentrations of both M1+ and X1- are found to be 1*10^-3 M. What is Ksp for MX

Question

anonymous · Answer

The Ksp expression for a salt is the product of the concentrations of the ions, with each concentration raised to a power equal to the coefficient of that ion in the balanced equation for the solubility equilibrium.

anonymous · Answer

so for M and X i can consider as X^2 and set it equal to 1*10^-3 M and solve for X?

anonymous · Answer

Yes that's right

anonymous · Answer

it keeps giving me a diff answer. the right answer is 1*10^-6

sweetburger · Answer

wait wait wait maybe i am just confused but wouldn't it be like this?
Ksp= [1*10^-3][1*10^-3] this is usually how you find the Ksp given the molar solubility

somy · Answer

take a look at this pic and read carefully

somy · Answer

MX <----> M1+  X1

thus 
Ksp= [M1][X1]

since concentrations for both M1 and X1 is same 

Ksp= [1*10^-3][1*10^-3]

= if you are not allowed to use calculator 
then $$1\times1=1$$ and now will work with powers, since its multiplication, powers are added up so $$-3+(-3)= -3-3=-6$$
thus your answer will be 
$$1\times 10^-6$$

anonymous · Answer

ok thx

somy · Answer

:)