Chapter 8 Lecture Notes (Free, Downloadable pdf)
Dr. Zoval’s General, Organic, and Biochemistry Textbook
(Free, Downloadable pdf)
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The color of the flowers on some species of Hydrangea, such as the Hydrangea macrophylla shown above, is determined by the acidity/basicity of the soil. Soils that are acidic cause H. macrophylla flowers to be blue (as seen in the photograph above), and soils that are basic cause the flower to be pink.