Ascorbic acid, H₂C6H6O6, is a diprotic acid usually known as vitamin C. For this acid, pKa1 is 4.10 and pka2 is 11.79. When 125 mL of a solution of ascorbic acid was evaporated to dryness, the residue of pure ascorbic acid had a mass of 4.31 g. Calculate the molar concentration of ascorbic acid in the solution before it was evaporated. i What was the pH of the ascorbic acid solution before it was evaporated? pH = What was the concentration of the ascorbate ion, C6H6O62, before the solution was evaporated? i M M

Ascorbic acid, H₂C6H6O6, is a diprotic acid usually known as vitamin C. For this acid, pKa1 is 4.10 and pka2 is 11.79. When 125 mL of a solution of ascorbic acid was evaporated to dryness, the residue of pure ascorbic acid had a mass of 4.31 g. Calculate the molar concentration of ascorbic acid in the solution before it was evaporated. i What was the pH of the ascorbic acid solution before it was evaporated? pH = What was the concentration of the ascorbate ion, C6H6O62, before the solution was evaporated? i M M

Chemistry & Chemical Reactivity

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Chapter20: Environmental Chemistry-earth's Environment, Energy, And Sustainability

Section20.7: Green Chemistry And Sustainability

Problem 2.1ACP: Assume that a sample of hard water contains 50. mg/L of Mg2+ and 150 mg/L of Ca2+, with HCO3 as the...

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Stoichiometry

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Question

Ascorbic acid, H₂C6H6O6, is a diprotic acid usually known as vitamin C. For this acid, pka1 is 4.10 and pka2 is 11.79. When 125 mL of a
solution of ascorbic acid was evaporated to dryness, the residue of pure ascorbic acid had a mass of 4.31 g.
Calculate the molar concentration of ascorbic acid in the solution before it was evaporated. i
What was the pH of the ascorbic acid solution before it was evaporated? pH = i
What was the concentration of the ascorbate ion, C₂H₂O6², before the solution was evaporated? i
M
M

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Step 1: Dissociation of weak acid!

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Step 2: Calculation for the molar concentration of ascorbic acid!

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Step 3: Finding out overall dissociation constant of ascorbic acid!

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Step 4: Formation of ICE table

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Step 5: Calculation for unknown y

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Step 6: Calculation for concentration of ascorbate ion!

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Step 7: Calculation for pH of the solution!

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