Tartaric acid
Explanation
Organic acids are naturally occurring weak acids found in various fruits, vegetables, and animal products. The specific sour taste of these items is attributed to the dominance of particular acidic compounds.
Analysis of Options
- Tartaric acid: This is the primary acid responsible for the sour taste in unripe mangoes. It is also abundantly found in tamarind and grapes.
- Acetic acid: This is the main component of vinegar and is formed through the fermentation of ethanol.
- Formic acid (Methanoic acid): This acid is present in the sting of ants, bees, and nettle leaves, causing pain and irritation.
- Lactic acid: This is found in sour milk and curd (yogurt) as a result of the bacterial fermentation of lactose.
Key Takeaway:
Tartaric acid is the characteristic organic acid found in unripe mangoes, grapes, and tamarind.