Acid in Fruits

Course 2 of 6 in Good Science Series

Smart Peg Lab


Did you know that fruits have acid in them? Learn how to do a fun and easy acid test using supplies you can find in your kitchen. Design a cause-and-effect experiment to compare the amount of acid in different fruits!

Course Information


By the end of this course, the student should be able to:

» describe and carry out a simple test to assess acidity

» use observation to identify cause-and-effect relationships

» plan and carry out an investigation to answer a scientific question

Supplies needed:

» science journal
» pencil
» test tubes or measuring cups
» measuring spoons
» baking soda
» 2 or more citrus fruits (lemon, lime, orange, tangerine, grapefruit)
» cutting board
» kitchen knife
» apron and safety goggles
» citrus juicer optional
» printer optional

Suggested Pacing:

Day 1 –  Getting Started and gather the Supplies Needed
Day 2 –
The Investigation a – b
Day 3 –
The Investigation c – d
Day 4 –
The Investigation ef
Day 5 –
What’s Next?

NGSS Standards:

Crosscutting Concepts (CCC)

» Cause and Effect (Grades K-2, 3-5 and MS)

  • Before starting this course you must complete the required prerequisite course: Smart Peg Safety