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The reaction between the hydrochloric acid and the calcium carbonate is: 2 HCl (aq) + CaCO3...

The reaction between the hydrochloric acid and the calcium carbonate is: 2 HCl (aq) + CaCO3 (s) ---> CaCl2 (aq) + H2O (l) + CO2 (g)

About 90 mL of water and 10.00 mL of 0.5023 M Hydrochloric acid solution was added to a 1.028 g paper sample. Following our procedure the mixture was stirred and then heated just to a boiling to expel the carbon dioxide. Titration of the excess HCl remaining in the mixture required 16.41 mL (corrected volume) of 0.1055 M NaOH. How many milligrams of calcium carbonate were present in the paper sample, and what is the percent calcium carbonate in this sample?

Mass of CaCO3 ___________________ mg

% CaCO3 _________________ %

Please SHOW all work and use correct number of SIGNIFICANT FIGURES. Thank you!

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