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The enthalpy of neutralisation of a weak...

The enthalpy of neutralisation of a weak acid in 1 M solution with a strong base is `-56.1` kJ `mol^(-1)`/ If the enthalpy of ionization of the acid is 1.5 kJ `mol^(-1)` and enthalpy of neutralization of the strong acid with a strong base is `-57.3` kJ `"equiv"^(-1)`, what is the % ionization of the weak acid in molar solution (assume the acid to be monobasic)?

A

10

B

15

C

20

D

25

Text Solution

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The correct Answer is:
C
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The enthalpy of neutralisation of a weak acid in 1 M solution with a strong base is -5.6 kJ mol^(-1) . Enthalpy of ionization of the acid is 1.5 kJ mol^(-1) and enthalpy of neutralization of the strong acid with a strong base is -57.3 kJ"equiv"^(-1) , what is the % ionization of the weak acid in molar solution (assume the acid to be monobasic) ?

The enthalpy of neutralization of a strong acid by a strong base is always constant.

Knowledge Check

  • The enthalpy of a neutralisation of a weak acid in 1 M solution with a strong base is -56.1 kcal mol^(-1) if the enthalpy of ionisation of acid is 1.5 kcal mol^(-1) . If the enthalpy of ionisation of acid is 1.5 kcal mol^(-1) and enthalpy of neutralisation of the strong acid with a strong base is -57.3 kJ eq^(-1) . what is the % ionistion of the weak acid in molar solution (assume the aciid is monobasic)

    A
    25
    B
    20
    C
    15
    D
    10

  • Heat of neutralization of strong acid and weak base is

    A
    57.1 kJ `mol^(-1)`
    B
    13.7 kJ `mol^(-1)`
    C
    Less than 13.7 kcal `mol^(-1)`
    D
    More than 13.7 kcal `mol^(-1)`

  • The enthalpy of neutralization of a Weak monoprotic acid (HA) in 1 M solution with a strong base is -55.95 KJ/mol . If the unionized acid required 1.4 KJ/mol heat for it's comptate ionzatation and enthalpy of netralization of the strong monobasic acid with a strong monoacidic base is -57.3 KJ/mol . What is the % ionzation of the weak acid in molar solution ?

    A
    `1%`
    B
    `3.57`
    C
    `35.7%`
    D
    `10%`

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