MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Abnormal Colligative Properties

2.5 g of a mo...

Question

2.5 g of a monobasic acid when dissolved in 100 g of water elevates the boiling point of the solution by ${0.256}^{\circ} C$ . If 0.5 g of the acid requires 8 milliequivalents of NaOH for complete neutralisation, then the degree of dissociation of the acid is: [ $K_{b}$ of water $= 0.512 K k g m o l^{- 1}$ ]

Open in App

Solution

To find molar mass of acid we can simply relate gm equivalents of the acid with the base,
$\frac{0.5}{M} \times 1 = 8 \times 10^{- 3}$
$M = 62.5 gm$
$Δ T_{b} = K_{b} i m \Rightarrow 0.256 = 0.512 (1 + α) m$
$0.256 = 0.512 (1 + α) \times \frac{2.5 \times 1000}{62.5 \times 100}$
$α = 0.25$

Suggest Corrections

thumbs-up

0

Similar questions

1.0 g

of a monobasic acid

H A

100 g

water lowers the freezing point by

0.155 K

0.75 g

, of same acid requires

15

N / 5 N a O H

solution for complete neutralisation then %, degree of ionization if acid is (

K_{f} o f H_{2} O = 1.86 K k g m o l^{- 1}

Q. 1.5 g of a monobasic acid, when dissolved in 150g of water, lowers the freezing point by

{0.165}^{\circ}

C. 0.5 g of the same acid when titrated, after dissolution in water, requires 37.5 ml of N/10 alkali. Calculate the degree of dissociation of the acid ?(

K_{f}

{1.86}^{\circ}

^{- 1}) .

Q. 1g of a monobasic acid in 100 g water lowers the freezing point by

{0.168}^{o}

C. If 0.2 g of the same acid requires 15 ml of

\frac{N}{10}

alkali solution for complete neutralization, the degree of dissociation of acid is nearly:

K_{f}

H_{2} O = 1.86 K k g m o l^{- 1})

Q. 1.0 g of a weak monobasic acid (

H A

), when dissolved in 150 mL water, lowers the freezing point by

{0.186}^{o} C

. Also 1.0 g of the same acid required 125 mL of a 0.10N Nate solution for complete neutralisation. Determine dissociation constant

(k_{a})

of the weak acid.

k_{f}

of water is 1.86 K kg

m o l^{- 1}

4.08

g of a mixture of

B a O

and unknown carbonate

M C O_{3}

was heated strongly, the residue weighed

3.64

g. This was dissolved in

100

1 N

H C l

. The excess acid required

16

2.5 N

N a O H

solution for complete neutralisation. Identify the metal

M

.

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Abnormal Colligative Properties

CHEMISTRY

Watch in App

explore_more_icon

Explore more

Abnormal Colligative Properties

Standard XIII Chemistry

Join BYJU'S Learning Program

CrossIcon