Limestone consists mainly of the mineral calcite, CaCO3. The carbonate content of 0.5413 g of powdered limestone was measured by suspending the powder in water, adding 10.00 mL of 1.396 M HCl, and heating to dissolve the solid and expel CO2:

The excess acid required 39.96 mL of 0.100 4 M NaOH for complete titration. Find the weight percent of calcite in the limestone.

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CaCO3(s) + 2H+ Ca2+ + CO, ↑ + H2O -> Calcium carbonate FM 100.087