6.1: Description

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Page ID: 567836

Deboleena Roy
American River College

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Many household solutions or chemicals have acidic or basic (alkaline) properties. The pH scale helps us to determine this property. In this home-based experiment, you will use the extract of red cabbage to test liquids and chemicals around you. The red cabbage contains a pigment called flavin, which responds to the concentration of H₃O⁺ ions and produces a color change. Based on this color change you will successfully identify the approximate pH of common household chemicals using the color standard posted on canvas.

This experiment will meet objectives from unit 1, 2, and 3. In order to understand the experiment you are encouraged to learn about acids and bases first. The experiment can be performed easily at home. The report for the project is due in two weeks.

Cabbage Indicator pH 2-7.jpg

Indicator color for pH 2 through 7 (first picture with pink to blue color)

Indicator color for pH 8 through 12 (2nd picture with blue to yellow color)

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