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Calculation of kb of water

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Q. Calculate the

p H

0.1 M

N H_{4} C l

solution in water :

K_{b} (N H_{4} O H) = 1.8 \times 10^{- 5}, l o g 1.8 = 0.25

Q. Calculate the molal elevation constant,

K_{b}

for water and the boiling of 0.1 molal urea solution. Latent heat of vaporisation of water 9.72 kcal

m o l^{1}

Q. After adding a solute freezing point of water solution decreases to

{- 0.186}^{o} C

Δ T_{b}

K_{f}

= {1.86}^{o} C k g m o l^{- 1}

K_{b}

= {0.512}^{o} C k g m o l^{- 1}

)

Q. Calculate the boiling point of solutions when 2 g of

N a_{2} S O_{4} (M = 142 g m o l^{- 1})

is dissolved in 50 g of water, assuming

N a_{2} S O_{4}

undergoes complete ionization. (

K_{b}

for water = 0.52 K kg

m o l^{- 1}

Q. Calculate the boiling point of solution when 4g of

M g S O_{4} (M = 120 g m o l^{- 1})

was dissolved in 100g of water, assuming

M g S O_{4}

undergoes complete ionization.

K_{b}

0.52 K k g m o l^{- 1}]

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