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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...

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Related Experiment Video

Updated: Jun 26, 2026

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

Published on: July 22, 2019

How to use: a pH study

M P Tighe¹, M Cullen, R M Beattie

¹Paediatric Medical Unit, Southampton General Hospital, Southampton, UK.

Archives of Disease in Childhood. Education and Practice Edition

|January 23, 2009

Summary

No abstract available in PubMed .

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