14.27mL of a solution of the diprotic acid H2SO4 is titrated, and 53.90 mL of 0.35M NaOH is required to reach the equivalence point. What is the originial concentration of the acid solution?
millimoles of NaOH = 53.90 x 0.350 = 18.865
H2SO4 + 2 NaOH --------------> Na2SO4 + 2 H2O
1 2
1 mol H2SO4 ------------> 2 mol NaOH
?? ------------> 18.865 mol NaOH
moles of H2SO4 = 18.865 / 2 = 9.4325
moles = Moalrity x volume
9.4325 = Molarity x 14.27
Moalrity = 0.661 M
originial concentration of acid = 0.66 M
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