A sample of fresh grapefruit juice was filtered and titrated with the above I2 solution. A 100-mL sample of the juice took 9.58 mL of the iodine...

A sample of fresh grapefruit juice was filtered and titrated with the above I2 solution. A 100-mL sample of the juice took 9.58 mL of the iodine solution to reach the starch end point.a.) what is the concentration of vitamin C in the juice in mg vitamin C/100mL of juice?b.) what quantity of juice will provide the RDA amount of vitamin C?"