This is almost like your other buffer posts. Use the Henderson-Hasselbalch equation.
pH = pKa + logp[(base)/(acid)]
The base is the ascorbate salt and the acid is ascorbic acid.
Post your work if you get stuck.
What is the pH of a solution that consists of 0.50M H2C6H6O6(ascorbic acid) and 0.75M NaHC6H6O6(sodium ascorbate)? for ascorbic acid, Ka=6.8x10-5
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