A piece of chalk (mainly calcium carbonate) is placed in 250. mL of 0.281 M HCl. All the CaCO3 reacts, releasing carbon dioxide gas and leaving 250. mL of a clear solution. 50.00 mL of the solution is pipetted into another flask. 63.3 mL of 0.0521 M NaOH is required to titrate the HCl remaining in this 50.00-mL portion. What was the original mass of CaCO3 in the piece of chalk?

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Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.