The amount of CaCO3 in an antacid tablet was determined by back titration. An excess of HCl (50mls of 1.0M HCl) was added to four powdered tablets (total mass of tablets 2.110g) and left overnight. The next day, 10ml aliquots of the solution was titrated against 0.2M NaOH. An average titre value of 16.55mls was determined. Determine the amount of CaCO3 present in one tablet; express your answer as g/tablet and as %wt/wt.

Question

The amount of CaCO3 in an antacid tablet was determined by back titration. An excess of HCl (50mls of 1.0M HCl) was added to four powdered tablets (total mass
of tablets 2.110g) and left overnight. The next day, 10ml aliquots of the solution was
titrated against 0.2M NaOH. An average titre value of 16.55mls was determined.
Determine the amount of CaCO3 present in one tablet; express your answer as g/tablet and as %wt/wt.

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