Question

Among the following, which pair of acid and base has highest negative enthalpy of
neutralization? (Neglect hydrolysis of ions)
O HCl and NaOH
CH3COOH and NaOH
CH3COOH and NH4OH
HCl and NH OH

Answer 1

Answer:

(A)HCl and NaOH pair would have highest negative enthalpy of neutralization.

Explanation:

enthalpy of neutralization is the amount of heat released when an acid and base reacts to form a stable salt.

In case of strong acid  and strong bases it is -57.62kJ/mol at 25°C.

In case of weak acid or weak base, this enthalpy is lower because the extra energy is utilized in dissociation those weak acids or weak bases.

in the given options only option A has both strong acid and strong base thus will have maximum enthalpy of neutralization.

The second and fourth option has one weak and one strong component so their enthalpy would be intermediate.

The third option contains both weak components and thus will have weakest enthalpy of neutralization.

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