Question

A sample of impure Limestone weighing 0.3440 g was treated with 50 mL of HCl 0.1363 mol/l. after elimination of all CO2 by boiling,
excess acid was created by 4.45 mL of NaOH 0.1445 mol/L1. Calculate the% (w/w) of CaO and CaCO3 in the sample

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