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December 20, 2014

Homework Help: Chemistry

Posted by Bob on Thursday, September 20, 2012 at 12:18am.

A 0.41 g sample of limestone was dissolved in HCl and all the calcium in the limestone was converted to Ca2+(aq). The solution was treated with excess ammonium oxalate, (NH4)2C2O4(aq), and it was found that 3.0 g of calcium oxalate, CaC2O4(s) was precipitated. Calculate the percentage of calcium in the limestone. (Please give your answer to 4 significant figures)

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