Pure Water - GCSE Chemistry Definition

Pure water contains only water molecules (H₂O) and no dissolved substances like salts, minerals, or chemicals. It is not commonly found in nature because water easily dissolves other substances, so most natural water is a mixture.

Pure water has specific properties at standard atmospheric pressure:

• Boiling point: 100°C

• Freezing point: 0°C

• pH: 7 (neutral)

In GCSE Chemistry, pure water is important for studying purity, physical properties, and how impurities affect boiling and melting points. It is often purified in the lab through methods like distillation.