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Question
Define an acid.
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Solution
An acid is defined as a compound which when dissolved in water produces hydronium ion (H3O+), the only positively charged ion and a negative ion. At first the acid furnishes hydrogen ion (H+) in aqueous solution but this H+ ion combines with a water molecule to form Hydronium ion.
For example : acetic acid, sulphuric acid, nitric acid.
CH3COOH + H2O → H3O+ + CH3COO-
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