1. Oxalic acid
  2. Ascorbic acid
  3. Tartaric acid
  4. Formic acid
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Option 3 : Tartaric acid

The most abundant acid in grapes is a Tartaric acid which accounts for more than 90% of total acids, then Malic acid and small amounts of Citric, Quinic, ascorbic and stearic acids.

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