Is pure water heterogenous or homogeneous?        

Expert Answers

An illustration of the letter 'A' in a speech bubbles

Pure water is composed entirely of water molecules. A sample that is composed of only one substance is called a pure substance

Mixtures contain two or more different types of substances. The terms homogeneous and heterogeneous are usually used to describe how the substances in a mixture are arranged:

  • Homogeneous Mixture: In a homogeneous mixture, substances are evenly mixed throughout the mixture. Every sample taken from a homogeneous mixture will contain the same substances. Example: salt water.
  • Heterogeneous Mixture: In a heterogeneous mixture, substances are unevenly mixed. Samples taken from different parts of the mixture may contain different substances. Example: oil and water.

In summary,

  • Pure Water is a pure substance. It contains only water molecules. The terms homogeneous and heterogeneous are not usually used to describe pure substances. 
  • A mixture of water and salt is an example of a homogeneous mixture because the salt is evenly mixed throughout the water.
  • A mixture of water and oil is an example of a heterogeneous mixture because the water and oil separate into two separate layers and are not evenly mixed.


See eNotes Ad-Free

Start your 48-hour free trial to get access to more than 30,000 additional guides and more than 350,000 Homework Help questions answered by our experts.

Get 48 Hours Free Access
Approved by eNotes Editorial Team