How can you test the presence of an acid in a substance
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Add water to it and if it will liberate hydrogen gas then it is an acid
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Test with litmus paper: Place a drop of the given substance on a moist litmus paper. If the colour changes to red, it is an acid. ii) Test with metals: Acids react with metals to produce salt and hydrogen gas. So if the given substance gives a gas with metals and the gas burns with explosion, then it is acid.
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