an old tablet of vitamin c weighed 1.022 g. It was dissolved in 500 mL water, and a 25.0 mL aliquot of this solution required 22.6 mL of .005 M I2 solution to oxidize it. Calculate the mg vitamin C in the tablet.

Answer 1

C6H8O6 + I2 + H2O → C6H6O6 + 2I^- + 2H^+

mols I2 = M x L = ?
mols vit C = mols I2 since the ratio is 1:1 in the balanced equation.
g vit C in the titrated portion = mols x molar mass. Convert to mg vit C the multiply by 500/25 to give mg vitamin C in the tablet.

Answer 2

Would you just neglect 500. mL of water and 25.0 mL of aliquot?