Question

A solution of acetone in ethanol ______.

Options

• shows a positive deviation from Raoult's law

• behaves like a non-ideal solution

• obeys Raoult's law

• shows a negative deviation from Raoult's law

Answer 1

A solution of acetone in ethanol shows a positive deviation from Raoult's law.

Explanation:

A solution of acetone in ethanol deviates from Raoult's law in a positive way. This is due to the fact that ethanol molecules are strongly hydrogen-bonded. When acetone is added, the hydrogen bonds are broken and ethanol becomes more volatile. As a result, its vapour pressure rises.