Homework Help: chemistry

Posted by Monique on Saturday, November 12, 2011 at 11:06pm.

What is the concentration of the Mg2 ion in solution when [CO3-2] = 0.25M given that the
Ksp= 6.82 x 10-6 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 10-6 to find Mg^2+.
dont think I understand

chemistry - DrBob222, Saturday, November 12, 2011 at 11:57pm
You know Ksp(6.82E-6). You know Co3^2- (0.25M). You have only one unknown, Mg^2+. Solve for that.
chemistry - Sarah, Sunday, November 13, 2011 at 12:02am
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, Sunday, November 13, 2011 at 2:34am
ok DrBob the answer i got was 2.7 x10-5 am i correct
chemistry - Sarah J, Sunday, November 13, 2011 at 7:10am
Yes Monique that is the answer.

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