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Needed table values (constants) for ascorbic acid, C6H8O6:

pKa = 4.10 , molar mass = 176.12 g mol−1.

Formula:

pH = 0.5*{pKa - log(Ca)} , where Ca = ascorbic acid concentration in mol/L .

Calculus:

4.00 g/L Ascorbic acid (C6H8O6) = 4.00(g/L) / 176.12(g/mol) = 0.0227 mol/L Asc.acid

pH = 0.5 * {4.11 - log(0.0227)} = 0.5 * {4.11 + 1.64} = 2.88 => about 2.9

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