An unknown diprotic acid requires 44.39 mL of 0.111 M NaOH to completely neutralize a 0.580-g sample.Calculate the approximate molar mass of the acid.

Question

Quizplus · Accepted Answer

The diprotic acid reacts with NaOH in a 1:2 ratio. Calculate moles of NaOH: 0.04439 L * 0.111 mol/L = 0.00493 mol. Since the acid is diprotic, moles of acid = 0.00493 mol / 2 = 0.002465 mol. Molar mass = 0.580 g / 0.002465 mol = 235 g/mol.

An Unknown Diprotic Acid Requires 44