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Standard XII

Chemistry

Enthalpy

Boiling point...

Question

Boiling point of 0.01 M AB2 which is 10%dissociated in aqueous medium (Kb = 0.52) as A2 and B(1) 273.006 K(2) 373.006 K(3) 0.006 k(4) 272.006

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A B_{2}

10 %

dissociated in water to

A^{2 +}

and

B^{-}

. The boiling point of a

10.0

molal aqueous solution of

A B_{2}

^{\circ} C .

(Round off to the nearest Integer).
[Given: Molal elevation constant of water

K_{b} = 0.5 {K kg mol}^{- 1}

, boiling point of pure water

= 100^{\circ} C

]

Q. Calculate the elevation in boiling point for

12 g

A B_{2}

dissolved in

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of water as solvent if

A B_{2}

is fully ionised?
Given:

A B_{2}

dissociates as:

A B_{2} \to A^{2 +} + 2 B^{-}

(

K_{b} = 0.52 K k g m o l^{- 1}

Molar mass of

A B_{2} = 120 g / m o l

)

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100^{\circ}

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