acids

• Grapes, Tamarind – Tartaric acid
• Vinegar – Acetic acid
• Orange, lemon – Citric acid
• Curd – Lactic acid
• Tea – Tannic acid
• Apple – Malic acid
• Tomato – Oxalic acid
• Ants – Formic acid
• Soda – Carbonic acid
• Urine - Uric acid
• Stomach – Hydrochloric acid