Write two differences between ideal and non-ideal solutions.

Ideal solutions : An ideal solution is the solution which obeys Raoult's law perfectly over entire range of concentration and temperature and during its formation there is no change in its enthalpy and volume. Such solutions are formed by mixing the two components which are identical in molecular size, in structure and have almost identical intermolecualr forces. Examples of ideal solution:- Chlorobenzene and bromobenzene; Benzene and toluene; Ethyl bromide and ethyl iodide. Non-ideal solutions : Those solutions which do not obey Rault's law are called non-ideal solutions. Non ideal solutions are formed when the components differ much in their structures and polarities. Non ideal solutions show either positive or negative deviations from Rault's law. Examples of non-ideal solution :- Ethanol and cyclohexane; Acetone and benzene; Water and methanol.

HARD

12th West Bengal Board

IMPORTANT

Earn 100

What mass of non-volatile solute, sucrose, need to be dissolved in $100 g$ of water to decrease the vapour pressure of water by $30 % ?$

Important Questions on Solutions

HARD

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 22

A solution is made by dissolving

1.0 g

urea and

2.0 g

sucrose in

100 g

water at

298 K,

predict the vapour pressure of solution if the vapour pressure of water at

298 K

23.756

torr.

MEDIUM

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 23

18 g

of glucose,

C_{6} H_{12} O_{6}

is dissolved in

1 kg

of water in a saucepan. At what temperature will the water boil at (

1.013 bar

pressure) .

K_{b}

for water is

0.52 K kg {mol}^{- 1} .

MEDIUM

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 24

The boiling point of benzene is

353.23 K .

When

1.80 g

of a nonvolatile solute was dissolved in

90 g

of benzene, the boiling point is raised to

354.11 K .

Calculate the molar mass of the solute.

K_{b}

for benzene is

2.53 K kg {mol}^{- 1} .

HARD

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 25

For a solution of

3.795 g

of sulphur in

100 g {CS}_{2},

the boiling point was

319.81 K .

For pure

{CS}_{2},

the boiling point is

319.45 K

and the enthalpy of vapourisation is

351.87 . {Jg}^{- 1} .

What is the molar mass and formula of sulphur in

{CS}_{2} ?

MEDIUM

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 26

A solution containing

7.5 g

of urea (Mol. wt.

60

) in one

kg

of water freezes at the same temperature as another solution containing

15 g

of solute

S

in the same amount of water. Calculate molecular mass of

S .

HARD

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 27

Water is used in car radiators. In winter season, ethylene glycol is added to water so that water may not freeze:
Assuming ethylene glycol to be non-volatile, calculate minimum amount of ethylene glycol that must be added to

6.0 kg

of water to prevent it from freezing at

- 0.3 ° C .

The molal depression constant of water is

1.86 ° .

HARD

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 28

$45 g$ of ethylene glycol $C_{2} H_{6} O_{2}$ is mixed with $600 g$ of water. Calculate the freezing point depression.

HARD

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>Follow Up Problems>Q 28

$45 g$ of ethylene glycol, $C_{2} H_{6} O_{2}$ is mixed with $600 g$ of water. Calculate the freezing point of the solution.

What mass of non-volatile solute, sucrose, need to be dissolved in 100 g of water to decrease the vapour pressure of water by 30%?

Important Questions on Solutions

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What mass of non-volatile solute, sucrose, need to be dissolved in $100 g$ of water to decrease the vapour pressure of water by $30 % ?$