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Reaction of Metallic Oxides and Hydroxides with Acids

What is the n...

Question

What is the numerical value of enthalpy of neutralisation ? .(in $k J m o l^{- 1}$ .)

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Solution

The reaction in which an acid and a base react to give a salt and water is called neutralization reaction. Neutralization reactions are exothermic in nature. The heat change when one gram equivalent of an acid is completely neutralised by a base or vice versa in dilute solution, is called heat of neutralization and it is $- 57.3 k J m o l^{- 1}$ .

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Q. The enthalpy of neutralisation of strong acid by a strong base is

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

. The enthalpy of formation of water is

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

. The enthalpy of formation of hydroxyl ion is :

Q. Assertion :The value of enthalpy of neutralisation of weak acid and strong base is always numerically less than

57.1 k J

. Reason: All the

{O H}^{-}

ions furnished by

1

gram equivalent of strong base are not completely neutralized.

Q. What is the enthalpy of neutralisation?

Δ H_{f}^{\circ}

- 285.8 {kJ mol}^{- 1}

. If the enthalpy of neutralisation of monoacidic strong base is

- 57.3 {kJ mol}^{- 1}

Δ H_{f}^{\circ}

O H^{-}

Q. Bond dissociation enthalpies of

H_{2} (g) a n d N_{2} (g)

436.0 k J m o l^{- 1}

941.3 k J m o l^{- 1}

respectively. Enthalpy of formation of

N H_{3}

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

. What is the enthalpy of atomization of

N H_{3}

.

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