Understanding Acids and Bases: Natural Indicators and Their Color Changes
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This chapter explores the similarities and differences between acids and bases, highlighting natural indicators like beets, curry powder, geranium petals, and grapes. Each of these substances demonstrates distinct color changes when exposed to varying pH levels. For instance, beet juice shifts from red to purple in basic solutions, while curry powder reveals a transformation from yellow to red. In our Virtual Lab, we utilized red cabbage, which also serves as an effective natural indicator. Dive into the world of acids, bases, and their fascinating natural indicators!
Understanding Acids and Bases: Natural Indicators and Their Color Changes
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Presentation Transcript
Chapter 16 Acids and Bases
Target 1: • I can label similarities and differences in acids and bases.
Natural Indicators • Things found in nature which indicate acids vs. bases
Beets • A very basic solution will change the color of beets or beet juice from red to purple
Curry Powder • Curry contains the pigment curcumin, which changes from yellow at pH 7.4 to red at pH 8.6.
Geranium Petals • Geraniums contain the anthocyanin pelargonin, which changes from orange-red in an acidic solution to blue in a basic solution
Grapes • Red and purple grapes contain multiple anthocyanins. Blue grapes contain a monoglucoside of malvinidin which changes from deep red in an acidic solution to violet in a basic solution.
