A sample of fresh grapefruit juice was filtered and titrated with the above I2 solution. A 100 mL sample of the juice took 9.85 mL of the iodine solution to reach the starch endpoint.
a. What is the concentration of vitamin C in the juice in mg vitamin C/100 mL of juice (mg/ 100 mL)?
b. What quantity of juice will provide the RDA amount of vitamin C (mL)?