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Acidity of Alcohols and Phenols

Why is the en...

Question

Why is the enthalpy of neutralization of weak acid less than that of a strong acid

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Solution

Enthalpy of neutralization is the amount of heat produce when an acid reacts with the alkali and produce 1 mole of water.

Heat of neutralization depends upon

Bascity of an acid

Strength of an acid

Strength of an alkali

In case of strong acid and alkali, complete ionization is possible so 57.3 kj/mol of energy released.

But weak acid or base will not ionise completely in water. Some remains as undissociated molecules in water. Some amount of heat of neutralization is used to ionise undissociated molecules. As some amount of energy consumed, energy release is less in case of weak acid or alkali.

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Similar questions

Heat of neutralization of weak acid and strong base is less than the heat of

neutralisation of strong acid and strong base due to

Q. The enthalpy of neutralization of a weak acid in

1 M

solution with a strong base is

- 56.1 k J m o l^{- 1}

. If the enthalpy of ionization of the acid is

1.5 k J m o l^{- 1}

and enthalpy of neutralization of the strong acid with a strong base is

- 57.3 k J e q u i v^{- 1}

, what is % ionization of the weak acid in molar solution (assume the acid to be monobasic)?

Q. The enthalpy of neutralization of a weak monoprotic acid (

H A

1 M

solution with a strong base is

- 55.95 k J / m o l

. If the unionized acid is required

1.4 k J / m o l

heat for it's complete ionization and enthalpy of neutralization of the strong monobasic acid with a strong monoacidic base is

- 57.3 k J / m o l

. What is the % ionization of the weak acid in molar solution?

Q. The enthalpy of neutralization of a weak monoacidic base

(1 M)

with a strong acid is

- 56.9 k J / m o l

. If the enthalpy of ionization of a weak monoacidic base is

1.8

k J / m o l

then the ionization of weak base in its molar solution is: (Given that

Δ H_{n e u t r a l i s a t i o n}

of a strong acid and strong base

= - 57.3 K J / m o l

)

Q. The enthalpy of neutralisation of a weak acid is less than that of a strong acid. The difference of the latter from the former is known as enthalpy of ionisation of the weak acid.
If true enter 1 else 0.

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