Using the avg molarity of ascorbic acid for the juice how ma

Post-Laboratory Questions 1. The Recommended Daily Allowance (RDA) of ascorbic acid is 60 mg. How many moles of detm is ww ascorbic acid is this? (Show your work) 5 2. Using your average molarity of ascorbic acid for the juice, how many ml of the juice are needed to reach the RDA? (Show your work.) Analyzing Juice for Vitamin C-7

Solution

1)

molar mass of ascorbic acid = 176.12 gm / mole.

60 mg = 0.060 gm ascorbic acid = mass / molar mass = 0.060 / 176.12 = 3.407 * 10^-4 mole.

moles of ascorbic acid is 3.407 * 10^-4 mole.

2)

AVG molarity = 9.0x10^-2 M

means 9.0x10^-2 mole ascorbic acid remains in 1 litre or 1000 ml solution.

volume of juice needed = 1000 * 3.407 * 10^-4 / 9.0 * 10^-2 = 3.79 ml.