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Fuel for Living Things

Author(s): Nancy P. Moreno, PhD, Barbara Z. Tharp, MS, and Judith Dresden, MS.


  • Encourage the students to think of variations to the experiment, ask additional questions, and/or identify other examples of acids and bases.
  • Assess students’ understanding of the experiment by having them write a paragraph describing the investigation and the results. Have them describe what caused the indicator solution to turn pink or green.
  • Have students observe how humans exhale carbon dioxide by blowing through a straw into the indicator solution. They will see the solution turn a pink color, due to the presence of carbon.  

Funded by the following grant(s)

National Institute of Environmental Health Sciences, NIH

National Institute of Environmental Health Sciences, NIH

My Health My World: National Dissemination
Grant Number: 5R25ES009259
The Environment as a Context for Opportunities in Schools
Grant Number: 5R25ES010698, R25ES06932

Houston Endowment Inc.

Foundations for the Future: Capitalizing on Technology to Promote Equity, Access and Quality in Elementary Science Education