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Standard XII

Chemistry

Depression in Freezing Point

23.When 0.1 m...

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23.When 0.1 mole CH3COOH is present in a litre solvent it shows elevation in boiling point of 0.75^° C. Acid dissociation constant will be – (Kb = 5 K Kg mol–1) and (M Image not present m)

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Q. When

0.1

mole

C H_{3} C O O H

is present in a litre solvent it shows elevation in boiling point of

{0.75}^{o}

C. Acid dissociation constant will be:

(K_{b} = 5 K k g m o l^{- 1})

and

(M ≃ m)

Q. What will be the elevation in boiling point for

13.44 g

C u C l_{2}

dissolved in

1 k g

of water as solvent if

C u C l_{2}

is fully ionised?
(

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

Molar mass of

C u C l_{2} = 134.4 g / m o l

)

Q. The boiling point elevation constant

(K_{b})

of water is

0.52 {K kg mol}^{- 1}

. The boiling point of

0.1 m a q .

solution of urea is:

The rise in the boiling point of a solution containing 1.8 gram of glucose in 100g of a solvent in 0.1⁰C. The molal elevation constant of the liquid is

Q. Calculate the elevation in boiling point for

12 g

A B_{2}

dissolved in

1 k g

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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