Homework Help: chem

Posted by mel on Friday, November 2, 2007 at 6:23pm.

how much of each of the following substances would you add to water to prepare 1.20L of a .85M solution? (sodium carbonate from the pure solid) ? I am stuck on how to work this one out, too. thanks

chem - DrBob222, Friday, November 2, 2007 at 6:27pm
You need mols Na2CO3 = L x M = 1.20 x 0.085 M = ??
mols Na2CO3 = g/molar mass
easier than the last one.

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