Homework Help: Chemistry

Posted by Monika on Thursday, April 28, 2011 at 11:35pm.

a solution contains an unkown amount of dissolved magnesium, addition odf 0.0877 mol of Na2CO3 causes complete precipitation of all the magnesium. what is the mass of magnesium was dissovled in the solution? you must write a balanced equation for the raction in order to solve this problem.

Chemistry - DrBob222, Thursday, April 28, 2011 at 11:47pm
Mg^2+ + CO3^= ==> MgCO3

0.0877 mol Mg^2+ uses that amount of CO3 and forms that amount of MgCO3.
gMgCO3 = moles MgCO3 x molar mass MgCO3.

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