Your Safer Source for Science

Since 1977

Address Flinn Scientific Canada, Inc. 175 Longwood Road South Hamilton, ON L8P 0A1
Phone 844-200-1455

Help from MOM

A Colourful Antacid Demonstration


Milk of magnesia (MOM) and other antacids are bases that relieve heartburn by neutralizing the acid found in the stomach’s gastric juices. When hydrochloric acid and universal indicator are added to milk of magnesia, a dramatic rainbow of colour changes is observed as the antacid neutralizes the simulated stomach acid. This is a great demonstration to teach concepts of acids and bases, solubility, digestion, and “antacid-testing” consumer biochemistry.


  • Biochemistry
  • Consumer Chemistry
  • Acids & Bases
  • Indicators
  • pH