Key definitions:

pH: the amount of charged hydrogen atoms in a liquid

Acids: high concentration of hydrogen ions

Bases: low concentration of hydrogen ions

Supplies:

• 3 identical cups

• 3 cups of water

• Lemon juice (~1 tablespoon)

• Baking Soda (~1 tablespoon)

• 3 pH strips (I found mine online here: Litmus Paper 2 Pack pH Strips)

Related STEM Careers:

Check out our blog post about Environmental Scientists, the studiers and preservationists of nature!

Related STEM History:

Read our overview of the Atomic Model, and how scientists in the past learned about the basic unit of matter.