In which of the following neutralisation reac | vedclass

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Question

(D) The heat of neutralisation is defined as the amount of heat released when $1 \ gram$ equivalent of an acid is neutralised by $1 \ gram$ equivalent

Vedclass · Accepted Answer

$NaOH$ and $HCl$

Vedclass · Answer

(D) The heat of neutralisation is defined as the amount of heat released when $1 \ gram$ equivalent of an acid is neutralised by $1 \ gram$ equivalent of a base.For the reaction between a strong acid and a strong base,the enthalpy change is constant at approximately $-57.1 \ kJ \ mol^{-1}$ or $-13.7 \ kcal \ mol^{-1}$,because the reaction is essentially the formation of water from $H^+$ and $OH^-$ ions.When a weak acid or a weak base is involved,some of the heat released is consumed in the dissociation of the weak electrolyte.Since $NaOH$ is a strong base and $HCl$ is a strong acid,their neutralisation reaction releases the maximum amount of heat compared to reactions involving weak acids $(CH_3COOH)$ or weak bases $(NH_4OH)$.Therefore,the correct option is $(D)$.

Acid	$HF$	$HCl$	$HBr$	$HI$
$K_a$	$7.2 \times 10^{-4}$	$1 \times 10^6$	$1 \times 10^9$	$3 \times 10^{11}$

In which of the following neutralisation reactions will the heat of neutralisation be the highest?

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