. A 1.248 g limestone rock, which contains CaCO3 and other compounds, is pulverized and treated with 30.00 mL of 1.035 M HCl solution. The excess acid requires 11.56 mL of 1.010 M NaOH for neutralization. Calculate the percent by mass of calcium carbonate in the rock, assuming it is the only substance reacting with the HCl solution.

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