Ascorbic acid (vitamin C) is a diprotic acid having the formula H2C6H6O6. A sample of a vitamin supplement was analyzed by titrating a 0.5054 g sample dissolved in water with 0.0713 M NaOH. A volume of 10.80 mL of the base was required to completely neutralize the ascorbic acid. What was the percentage by mass of ascorbic acid in the sample? ____% asorbic acid
0.0713 M NaOH = mole NaOH/ 0.0108 L = 7.7004 E -4 mol NaOH
7.7004 E -4 mol NaOH x ( 1 mol asorbic acid / 1 mol NaOH ) = 7.7004 E -4 mol ascorbic acid
7.7004 E -4 mol ascorbic acid x 176.1248 g/mol ascorbic acid = 0.1356 g ascorbic acid
(0.1356 g ascorbic acid / 0.5054 g sample) x 100% = 26.8 %
but...its wrong. I really tried...
Where did I go wrong? Please explain. Thanks in advance!