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The heats of neutralisation of four acid...

The heats of neutralisation of four acids `a`, `b`, `c` and `d` when neutralised against a common base are `13.7`, `9.4`, `11.2` and `12.4` kcal respectively. The weakest among these acids is

A

a

B

b

C

c

D

d

Text Solution

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The correct Answer is:
B
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The heats of neutralisation of four acids A,B,C and D are -13.7,-9.4,-11.2 and -12.4kcal respectively, when they are neturalised by a common base. The acidic character obeys the order :

The heat of neutralisation for strong acid and strong base forming 2 moles of water is

The enthalpies of neutralisation of a string acid HA and a weaker acid HB by NaOH are -13.7 and -12.7 kcal Eq^(-1) , respectively. When one equivalent of NaOH is added to a mixture containing one equivalent of HA and HB , the enthalpy change was -13.5kcal . In what ratio is the base distributed between HA and HB ?

A solubility contains one mole each of HA and HB (both are weak acids) in one litre solution. Now 1 mole of NaOH is added to this solution so that both the acids are partly neutralised. Heat of neutralisation for HA and HB are- 11.8 and- 12.4 kcal respectively and the heat produced during partial neutralisation of HA and HB is- 12.25 kcal. Mole ratio of neutralisation of HA and HB is:

A solubility contains one mole each of HA and HB (both are weak acids) in one litre solution. Now 1 mole of NaOH is added to this solution so that both the acids are partly neutralised. Heat of neutralisation for HA and HB are- 11.8 and- 12.4 kcal respectively and the heat produced during partial neutralisation of HA and HB is- 12.25 kcal. pH of solution, if hydrolysis constant for A^(-) is 10^(-9) :

A solubility contains one mole each of HA and HB (both are weak acids) in one litre solution. Now 1 mole of NaOH is added to this solution so that both the acids are partly neutralised. Heat of neutralisation for HA and HB are- 11.8 and- 12.4 kcal respectively and the heat produced during partial neutralisation of HA and HB is- 12.25 kcal. The ratio of dissociation constant of two acids are:

Knowledge Check

  • The heats of neutralisation of four acids A,B,C and D are -13.7,-9.4,-11.2 and -12.4kcal respectively, when they are neturalised by a common base. The acidic character obeys the order :

    A
    `AgtBgtCgtD`
    B
    `AgtDgtCgtB`
    C
    `DgtCgtBgtA`
    D
    `DgtBgtCgtA`

  • The heats of neutralization of four acids A,B,C,D are -13.7,-9.4,-11.2 and -12.4 kcal respectively when they are neutralized by common base. The acidic character obeys the order.

    A
    `A gt B gt C gt D`
    B
    `A gt D gt C gt B`
    C
    `D gt C gt B gt A`
    D
    `D gt B gt C gt A`

  • The heat of neutralisation for strong acid and strong base forming 2 moles of water is

    A
    `-2 xx57.1 kJ`
    B
    `-57.1 kJ`
    C
    `-57.1/2 kJ`
    D
    Strong acid and strong base will not undergo neutralisation