Vitamin C is ascorbic acid, a monoprotic acid with a general formula of HC6H7O.. A
tablet of vitamin C weighing 1.72 g was dissolved into distilled water. The resulting
solution was titrated with a 0.1005 normal NaH solution. If 42.68 mL is required to
reach the phenolphthalein end-point, calculate % W/w vitamin C in the tablet.