Ascorbic acid vitamin c is a diprotic acid having the, Ask an Expert

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Ascorbic acid (vitamin C) is a diprotic acid having the formula H₂C₆H₆O₆. A sample of a vitamin supplement was analyzed by titrating a 0.2801 g sample dissolved in water with 0.0399 M NaOH. A volume of 13.68 mL of the base was required to completely neutralize the ascorbic acid. What was the percentage by mass of ascorbic acid in the sample?

?% ascorbic acid

An ore of barium contains BaCO₃. A 3.401 g sample of the ore was treated with HCl to dissolve the BaCO₃. The resulting solution was filtered to remove insoluble material and then treated with H₂SO₄ to precipitate BaSO₄. The precipitate was filtered, dried, and found to weigh 3.243 g.

What is the mass of barium in the sample?

What is the percentage by mass of barium in the ore? (Assume all the barium is precipitated as BaSO4.)

How many moles of barium were in the sample?

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