![]() ![]() Have students predict which test liquids they think are acidic and which are basic. Focus the conversation on topics such as acid rain and acid mine drainage. Lesson Recap & Predictions: As a class, review the concepts presented in the associated lesson that relate to pH. PH: A scale that measures acidity and basicity. Indicator: A solution that changes colors in the presence of acids and bases to help indicate the pH value. Conclude by leading a class discussion to compare results and conclusions, and make the connection to real-world applications, as described in the Assessment section.Īcid: A solution with a sour-taste and low pH value.īase: A solution with a sweet taste and high pH value.Have students complete the worksheet questions.Then have students use pH-indicator strips to measure and record the pH of the liquids in each cup.Have students record their observations on the worksheet and rank the test items based on their pH values (1 = lowest pH, 7 = highest pH). Add just enough indicator until a color change appears. Direct student groups to each pour a small amount from the "cabbage indicator" cup into the seven cups of different liquids and a powder. ![]()
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