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The enthalpy of neutralization of a weak...

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 is required 1.4 kJ/mol heat for it's complete ionization and enthalpy of neutralization of the strong monobasic acid with a strong monoacidic base is -57.3 kJ/mol. What is the % ionization of the weak acid in molar solution?

A

`1 %`

B

`3.57 %`

C

`35.7%`

D

`10%`

Text Solution

Verified by Experts

The correct Answer is:
B
`HA to H ^(+) + A ^(-) Delta _(r) H= 1. 4 kJ // mol , Delta H _("ncatralization") + Delta_(r) H`
` (H ^(+) + OH ^(-) to H _(2) O ) - 55 95 = Delta H _("ionization ")` for ` 1 MHA = 1. 35 J // mol`
`%` heat utilized by 1 M acid for ionization `= (1.35)/(1.4) xx 100 = 96. 43 %` so acid is `100 - 96.43 = 3.57%` ionized
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Knowledge Check

  • The enthalpy of neutralization of oxalic acid by a strong base is-25.4kcal mol^(-1). The enthalpy of neutralization of strong acid and strong base is–13.7 kcal eq^(-1). The enthalpy of dissociation of oxalic acid is:

    A
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    B
    2 kcal `mol ^(-1)`
    C
    18.55 kcal `mol ^(-1)`
    D
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    B
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