Chapter 4, Problem 57QAP

A sample of limestone weighing 1.005 g is dissolved in 75.00 mL of 0.2500 M hydrochloric acid. The following reaction occurs:

${\text{CaCO}}_3\left(s\right)+2{\text{H}}^{+}\left(aq\right)\to {\text{Ca}}^{2+}\left(aq\right)+{\text{CO}}_2\left(g\right)+{\text{H}}_2\text{O}$

It is found that 19.26 mL of 0.150 M NaOH is required to titrate the excess HCI left after reaction with the limestone. What is the mass percent of CaCO₃ in the limestone?