What does cabbage have in it that enables it to be a pH indicator?
Red cabbage contains a pigment molecules called flavin.
1. Explain how the chemistry of acid and bases affects the indicator.
Color change occurs over a range of hydrogen ion concentrations.
Weak acids= alkaline
Weak bases= acidic
Acids will donate hydrogen ions in an aqueous solution and have a love pH (pH<7)
Bases accept hydrogen ions and have a high pH (pH>7)
2. Explain how acid rain would affect red cabbage growth and development.
The soil, which controls the pH of the plant, can become too acidic from the acid rain. Most plants grow best when the soil is neutrally or slightly acidic.
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