A 0.450 g sample of impure CaCO3 is dissolved in50.0mL of 0.150M HCl.
CaCO3 + 2HCl ---> CaCl2 +H20 + CO2
the excess HCl is titrated by 7.45mL of 0.125M NaOH
Calculate the mass percentage of CaCo3 in the sample?
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