On mixing equal volumes of water and ethanol, what type of deviation would you expect from Raoult's law?
Answer: Positive deviation — ethanol breaks some of water's hydrogen bonds, weakening the net attractions.
Solution
Positive deviation from Raoult's law.
Ethanol molecules get between water molecules and break some of the hydrogen bonds; the new A–B attractions are weaker than the original A–A and B–B attractions, so each component escapes more readily and the vapour pressure is higher than Raoult's law predicts.
Ethanol molecules get between water molecules and break some of the hydrogen bonds; the new A–B attractions are weaker than the original A–A and B–B attractions, so each component escapes more readily and the vapour pressure is higher than Raoult's law predicts.
CBSE Class 12 Board · 2003 · Delhi Compartment · Subjective