m -cresolphthalein
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| General | |||||||||||||
| Surname | m -cresolphthalein | ||||||||||||
| other names |
3,3-bis (4-hydroxy-2-methylphenyl) -2-benzofuran-1 (3 H ) -one ( IUPAC ) |
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| Molecular formula | C 22 H 18 O 4 | ||||||||||||
| Brief description |
yellowish crystalline powder |
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| properties | |||||||||||||
| Molar mass | 346.38 g mol −1 | ||||||||||||
| Physical state |
firmly |
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| Melting point |
145 ° C |
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| solubility |
soluble in ethanol , acetone and glacial acetic acid |
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | |||||||||||||
m -Cresolphthalein is a triphenylmethane dye and belongs to the phthaleine family. The name is composed of m -cresol and phthalic anhydride . The corresponding sulfonphthalein is cresol purple . Like phenolphthalein, it is used asa pH indicator . At a pH of 9.76, the color changes from colorless to purple-red.
Individual evidence
- ↑ a b c d Dictionary of Analytical Reagents , 1st edition, Chapman & Hall 1993, ISBN 978-0-412-35150-1 , p. 256 ( limited preview in Google book search).
- ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.