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define acids
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Acid are sour substance which is used for various purposes such as cooking, neutralizing etc.
Acid have pH value less than 7. They are corrosive in nature. It changes it colour and act as an indicator like turning litmus paper red.
Example :- Vineger, citric acid etc.
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An acid is any hydrogen-containing substance that is capable of donating a proton (hydrogen ion) to another substance. A base is a molecule or ion able to accept a hydrogen ion from an acid. Acidic substances are usually identified by their sour taste.
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