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4. A 5.309 g antacid tablet, with CaCO3 as the active ingredient, was mixed was 30.0 mL of 0.831 M HCl.
It took 15.3 mL of 0.7034 M NaOH to neutralize the excess acid.
a) Calculate the volume of HCl neutralized by the NaOH.
b) Calculate the amount of HCl (in mL) neutralized by the antacid.
c) Calculate the mass of CaCO3 (in g) that reacted with HCl.
d) Calculate the mass percent of CaCO3 present in the antacid

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