Posted by Monique on .
What is the concentration of the Mg2 ion in solution when [CO32] = 0.25M given that the
Ksp= 6.82 x 106 for the following reaction
MgCO3>Mg +. CO32
Chemistry  DrBob222, Friday, November 11, 2011 at 5:34pm
Ksp = (Mg^2+)(CO3^2)
Substitute 0.25M for CO3^2 and solve for Mg^2+
Am I using 6.82 x 106 to find Mg^2+.
dont think I understand

chemistry 
DrBob222,
You know Ksp(6.82E6). You know Co3^2 (0.25M). You have only one unknown, Mg^2+. Solve for that.

chemistry 
Sarah,
you have the formula Ksp= [Mg] [CO3] and you need to substitute in.25 for CO3... And plug the Ksp in with what they gave you in the problem... algebraic equation getting Mg by itself which involves multiplying both sides by the reciprocating fraction and having a divisor. You should be able to get your answer

chemistry 
Monique,
ok DrBob the answer i got was 2.7 x105 am i correct

chemistry 
Sarah J,
Yes Monique that is the answer.