Young Macdonald's Farm PH -- Lesson Plan #1 for science unit Plants potential Hydrogen (pH) scale Introduction The potential Hydrogen or pH scale is used to describe the number or hydrogen ions in a given volume of water solution. ILLSTRATION OF HYDEROGEN ATOM Objective Explain how acids and bases are related to the pH scale. Vocabulary Water cycle pH scale Acid Base Neutral Materials pH Kit Ocean water Tap water Lake water Rain water ILLSTRATION OF COLOR SCALE FOR pH Procedure Have student follow directions on the pH scale kits to test for acid in the water sample NOTE* : This activity is for students to familiarize them selves with the pH scale kits. The readings of the pH scale for water samples should be between 5.6 (normal rain fall) To 7 (neutral distilled water). Discussion Questions 1. What is the average reading of each of the different samples of water? 2. What is the difference between acid, neutral , and base on the pH scale? 3. Did any of the samples read lower than 5.6 and did any read higher than 7 4. What is the average readings between the entire samples in the class Science Teacher: Mark Talty