Weak Acids (Section)
Tartaric acid is found in many fruits, including grapes, and is partially responsible for the dry texture of certain wines. Calculate the pH and the tartrate ion (C4H4O6 2-) concentration for a 0.250 M solution of tartaric acid, for which the acid-dissociation constants are listed in Table Did you have to make any approximations or assumptions in your calculation?
Table Acid-Dissociation Constants of Some Common Polyprotic Acids
Name | Formula | Ka1 | Ka2 | Ka3 |
Ascorbic | H2C6H6O6 | 8.0 × 10-5 | 1.6 × 10-12 |
|
Carbonic | H2CO3 | 4.3 × 10-7 | 5.6 × 10-11 |
|
Citric | H3C6H5O7 | 7.4 × 10-4 | 1.7 × 10-5 | 4.0 × 10-7 |
Oxalic | HOOC—COOH | 5.9 × 10-2 | 6.4 × 10-5 |
|
Phosphoric | H3PO4 | 7.5 × 10-3 | 6.2 × 10-8 | 4.2 × 10-13 |
Sulfurous | H2SO3 | 1.7 × 10-2 | 6.4 × 10-8 |
|
Sulfuric | H2SO4 | Large | 1.2 × 10-2 |
|
Tartaric | C2H2O2(COOH)2 | 1.0 × 10-3 | 4.6 × 10-5 |
|
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