Heat of Reaction (6)

Chemistry

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Neutralisation reactions can occur between acids and alkalis of different strengths as follows (2)

Strong acid and weak alkali

Neutralisation reactions can occur between acids and alkalis of different strengths as follows (3)

Weak acid and strong alkali

Neutralisation reactions can occur between acids and alkalis of different strengths as follows (4)

Weak acid and weak alkali

The theoretical value of the heat of neutralisation between a strong acid and a strong alkali

Is -57 kJ mol−1

Heat of neutralisaton of various neutralisation reactions: Strong acid + Strong Alkali → Salt + Water

-57 kJ mol−1

Heat of neutralisaton of various neutralisation reactions: Weak acid + Strong Alkali → Salt + Water

-55 kJ mol−1

Heat of neutralisaton of various neutralisation reactions: Strong acid + Weak alkali → Salt + Water

-52 kJ mol−1

Explanation related to heat of neutralisation that involves weak acids or weak alkalis (1)

Weak acids or weak alkalis ionise partially in water and some remain as molecules

Explanation related to heat of neutralisation that involves weak acids or weak alkalis (2)

Some of the heat released during neutralisation is absorbed and used to completely ionise the weak acid or weak alkali in water

Explanation related to heat of neutralisation that involves weak acids or weak alkalis (3)

Therefore, the heat released is lower

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