A 1.00-g solid sample containing a mixture of NaCl and H3C6H5O7, a triprotic acid, is dissolved in 15 ml of water. Titration of the acid solution requires 25.40 mL of 0.1598 M NaOH solution to reach the endpoint.
a). Calculate the mass percent of H3C6H5O7 in the solid mixture.
b). What is the concentration of the triprotic acid?