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Essential Oil of Chrysanthemum indicum

B Stoianova-Ivanova1, H Budzikiewicz, B Koumanova

  • 1Department of Chemistry, Sofia State University, Sofia, Bulgaria.

Planta Medica
|December 1, 1983
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Indicators02:39

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Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a solution, are called...