suppose the balanced chemical equation in Question (is: where: a, b, c, and d ar

Question

suppose the balanced chemical equation in Question (is: where: a, b, c, and d are stoichiometric coefficients for each compound. Question: At the end point of ascorbic acid titration using NaOH standard solution, 5.00 mL of a 0.40 mol/L NaOH standard solution was added to ascorbic acid (AA) solution. Use the following conceptual plan to calculate the mass of ascorbic acid (in gram) reacted with NaOH solution. Question 9 Suppose the mass of Vitamin C powder that you used for the above titration is 0.45 g (including the inactive ingredients). What is the mass of active ingredient (ascorbic acid) in gram per Vitamin C tablet? Assuming the mass of each Vitamin C tablet is 1.3 grams.

Explanation / Answer

moles of NaOH in 5mL of 0.4M solution = 0.4*0.005 = 0.002 moles

therefore the mole of AA reacted with NaOH = 0.002*(a/b)

Mass of AA = 0.002*(a/b)*176.12 = 0.3522*(a/b). If a/b = 1, then AA reacted with NaOH is 0.3522g

9) 0.45g of Vitamin C powder contains 0.3522g of AA and a Vitamin C tablet weighs 1.3g. Therefore, mass of AA in one tablet is (1.3/0.45)*0.3522 = 1.02g of AA.

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