A 0.450-gram sample of impure CaCO3(s) is dissolved in 50.0 mLof 0.150 M HCl(aq). The equation for the reaction is:
CaCO3(s) + 2 HCl(aq) ?CaCl2(aq) + CO2(g) +H2O(l)
The excess HCl(aq) is titrated by 7.65 mL of 0.125 M NaOH(aq).Calculate the mass percentage of CaCO3(s) in the sample.
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