Question

How to determine the boiling points of ethylene glycol and water in different composition?

Answer 1

Ethylene Glycol is completely miscible in water.  We first find the number of moles of Gycol and number of moles of water in the mixer.  Then we find the molar fraction of Ethylene Glycol. 

We know, from the standard tables ,  the vapour pressures (at equilibrium) of pure Ethylene glycol and pure water at their normal boiling points. 

Using Raoult's law of partial pressures, we find the molar weighted sum of vapour  pressures.  That is the vapour pressure of the mixer.

From the vapour pressure, and using the pressure-boiling point curve for Ethylene Glycol, we find the boiling point.

Answer 2

Ethylene glycol is used for automobile antifreeze mixtures.

The below given experiment's goal is to find the boiling point of ethylene glycol.

1. You will set up the beaker of 250 mL over the Bunsen burner over wire gauze and place the thermometer to identify the temperature in the liquid and it must prevent it from touching the beaker.
2. Continuously, heat the beaker until bubble formed with the help of stirring rod and the value of the temperature is recorded in the thermometer.
3. You may also remove the heat and it stops producing bubbles as the liquid cools and one must record the value of the temperature.

The boiling point value of  Ethylene glycol is $197.3 ^ { \circ } \mathrm { C }$.