Dilution — States of Matter | IGCSE Chemistry

Exam Frequency Analysis

Past paper frequency (2018 to 2024)

This topic accounts for approximately 6% of your exam marks.

stable

Low

Stable6%

Appears regularly as short-answer questions on particle diagrams and state changes.

Dilution is the addition of more solvent to an existing solution
The total number of solute particles is unchanged
Solute particles are now spread through a larger volume, so the concentration falls
A coloured solution fades with each stepwise dilution, but does not disappear immediately
Two conclusions follow:
- a small mass of solute contains a very large number of particles
- particles are not destroyed by dilution, only spread out further