Posted by Boo Boo on Friday, November 23, 2012 at 4:18pm.
% m/m (w/w) = grams solute/100 g solution.
225g of 10% means you want 225 g of a 10g solute/100 g solution.
For 225g you will need how much solute?
10 x 225/100 = 22.5 g solute.
You can do it another way if that makes it any clearer.
% w/w is (grams solute/g solution)*100 = %
(g solute/225)*100 = 10
Solve for g solute. You should get the same answer either way.
(g solute) = 10*225/100 = 22.5 g solute.
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