Problem: What is the pH of a 0.28 M solution of ascorbic acid (Vitamin C)? (The values for Ka1 and Ka2 for ascorbic acid are 8.0 x 10-5 and 1.6 x 10-12, respectively.)

FREE Expert Solution

Given: Ascrobic acid (H2C6H6O6)

Ka1 = 8.0x10-5

1st equilibrium reaction:                H2C6H6O6(aq) + H2O(l) → HC6H6O6­-(aq)H3O+(aq

Ka2 = 1.6x10-12

2nd equilibrium reaction:               HC6H6O6­-(aq) + H2O(l)C6H6O6­2­-(aq)H3O+(aq)

H3O+(aq) is also produced from the 2nd equilibrium reaction

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Problem Details

What is the pH of a 0.28 M solution of ascorbic acid (Vitamin C)? (The values for Ka1 and Ka2 for ascorbic acid are 8.0 x 10-5 and 1.6 x 10-12, respectively.)

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