Vitamin C is a water-soluble vitamin, so your body doesn\'t store it. You have t

Question

Vitamin C is a water-soluble vitamin, so your body doesn't store it. You have to get the required amount from your diet (citrus fruits are a great source!), or you could take a daily vitamin C supplement pill. Vitamin C is ascorbic acid, so to determine how much vitamin C (acid) has been placed in each pill, you could do an acid-base titration.

One vitamin C pill was dissolved in water and titrated to an endpoint by 16.00 mL of a 0.447 M solution of NaOH. How many grams of ascorbic acid were there in the pill? (MW of ascorbic acid is 176.1 /mol).

Explanation / Answer

The mass of ascorbic acid in the pill would be,

1.26 g

Calculations,

moles of ascorbic acid = moles of NaOH = 0.447 M x 16 ml = 7.152 mmol

mass of ascorbic acid in the pill = 7.152 x 176.1/1000 = 1.26 g

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