Address P.O. Box 219 Batavia, IL 60510
Phone 800-452-1261
Fax 866-452-1436

Not all acids are created equal. This demonstration examines the “frothing and foaming” activity of different acids with calcium carbonate and also their properties in the presence of their conjugate bases to distinguish strong versus weak acids. The use of a “rainbow acid” universal indicator produces a rainbow spectrum of color changes as the mixtures react.


  • Acids & Bases
  • pH
  • Strong vs. Weak Acids