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What Is a One Part Per Million Solution?

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


Have students work in groups of four. Place materials for groups on plastic trays, and set trays in a central location for Materials Managers to pick up.

Number six portion-size cups 1 through 6 (one set per group). Alternately, use commercially available chemistry trays or cut the bottoms of plastic egg cartons in half to create chemistry trays with six wells.

Materials per Student Group

  • 6 2-oz portion cups (numbered 1-6)
  • 2 9-oz clear plastic cups
  • 2 pipettes or droppers
  • Small bottle of blue or red food coloring
  • Water

Materials per Student

  • Copy of "What Does One in a Million Look Like?' page

Funded by the following grant(s)

National Institute of Environmental Health Sciences, NIH

National Institute of Environmental Health Sciences, NIH

The Environment as a Context for Opportunities in Schools
Grant Numbers: 5R25ES010698, R25ES06932

Houston Endowment Inc.

Houston Endowment Inc.

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