Question: A student analyzed a CaCO3 antacid tablet by neutralizing the base with an excess of .60 M HCL and back-titrating the excess with .50M NaOH.

A student analyzed a CaCO3 antacid tablet by neutralizing the base with an excess of .60 M HCL and back-titrating the excess with .50M NaOH.

He recorded the following data:

mass of tablet = 1.3g

amount of active ingredient CaCO3 per label = 500 mg

volume of HCl added: 25 mL

initial buret reading : 34 mL

final buret reading : 47.4 mL

If the concentration of the provided HCl is actually higher than .60M, would the determined mass of CaCO3 in the antacid tablet be too high or too low?

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