Question

a solution must be at a higher temperature than a pure solvent to boil. what colligative property can be employed to achieve this?

Answer 1

Boiling-point elavation.

Answer 2

Answer : The colligative property employed to achieve this can be, Elevation in boiling point.

Explanation :

Elevation in boiling point : It is defined as the temperature or boiling point of a liquid (a solvent) will be higher when the another compound is added. This means that a solution must be at a higher temperature or boiling point than a pure solvent.

For example : When a non-volatile solute (a salt) is added to a pure solvent such as water.

The formula for elevation in boiling point will be,

`\Delta T_b=k_b* m`

or,

`T_b-T^o_b=(1000* k_b* w_2)/(w_1* M_2)`

where,

`T_b` = boiling point of solution

`T^o_b` = boiling point of pure solvent

`k_b` = boiling point constant

m = molality

`w_2` = mass of solute

`w_1` = mass of solvent

`M_2` = molar mass of solute

Hence, the colligative property employed to achieve this can be, Elevation in boiling point.