Question
Why is the vapour pressure of a solution of glucose in water lower than that of water?
Solution
Answer:
The vapour pressure of a pure solvent decrease .
when a non-volatile solute is added to the solvent
this is because on adding the solute a fewer number of water molecules are present at the surface which can evaporate as some of the area is occupied by -non- volatile solute molecules thereby decreasing the vapour pressure of the solution of the glucose in wateris lower than pure water.
