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What is an acid?

An acid is a hydrogen-containing chemical compound which, when dissolved in water, gives hydrogen ion (H+) or hydrated hydrogen ion (H2O. H+) or hydronium ion (H3O+).

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2 What are bases and alkalies? 3 Define pH. 4 What are the practical applications of neutralisation reactions? 5 Why the salts solutions of strong acid and strong alkali are neutral?