A sample of fresh grapefruit juice was filtered and titrated with the I2 solution prepared in Part 2. A 100.0 mL sample of the juice took 9.85 mL of the iodine solution to reach the starch end point.

Question

A sample of fresh grapefruit juice was filtered and titrated with the I2 solution prepared in Part 2.   A 100.0 mL sample of the juice took 9.85 mL of the iodine solution to reach the starch end point.

What is the concentration of Vitamin C in 100ml juice?

What quantity of juice will privide the RDA amount of vit C?

DrBob222 · Answer

I don't now anything about part A.
Grams vitamin C in the 100 mL =
Liodine x Miodine x (1 mol I2/1 mol vit C) x molar mass vit C = grams vit C.
You can take the concn from there and look up the RDA value and calculate that form the concn.