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出典:Wiktionary
出典:『Wiktionary』 (2010/06/16 22:45 UTC 版)
thymolphthalein (uncountable)
出典:Wikipedia
出典:『Wikipedia』 (2011/04/06 08:26 UTC 版)
Thymolphthalein is an acid-base (pH) indicator. Its transition range is at approximately pH 9.3-10.5. Below this pH, it is colorless; above this pH, it is blue. The molar extinction coefficient for the blue thymolphthalein dianion is 38000 M-1cm-1 at 595 nm.
thymolphthalein