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Neutralisation Reaction

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Question

What happens to (a) the H⁺ ions, and (b) temperature of the solution, when an acid is neutralised?

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Solution

(a) When a base is added to an acid, it nullifies the effect of the acid and removes the H⁺ ions from it and turns them into water. During a neutralisation reaction, the H⁺ ions of an acid are converted into water.

The reaction can be represented as follows.
Acid + Base → Salt + Water
For example, when sodium hydroxide is treated with hydrochloric acid, sodium chloride and water are produced.

NaOH(aq) + HCl(aq) → NaCl(aq) + H₂O(l)

(b) The temperature of the solution increases, because a neutralisation reaction is an exothermic reaction in which heat is produced.

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