Chromotropic acid
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| General | |||||||||||||||||||
| Surname | Chromotropic acid | ||||||||||||||||||
| other names |
4,5-dihydroxynaphthalene-2,7-disulfonic acid ( IUPAC ) |
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| Molecular formula | C 10 H 8 O 8 S 2 | ||||||||||||||||||
| Brief description |
colorless crystals |
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| properties | |||||||||||||||||||
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| Physical state |
firmly |
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | |||||||||||||||||||
The chromotropic is a chemical compound from the group of sulfonic acids and naphthalene . It is used in the chromotropic acid reaction to determine free or removable formaldehyde and as a coupling component for azo dyes from the group of chromotropic dyes . The chromotropic dyes are used in some trichrome stains , such as the Gömöri trichrome stain , and for the quantitative determination of silver, boron, chromium, mercury, titanium, chromate, formaldehyde, nitrite and nitrate.
Individual evidence
- ↑ a b Entry on chromotropic acid disodium salt. In: Römpp Online . Georg Thieme Verlag, accessed on January 20, 2014.
- ↑ a b Data sheet Chromotropic acid disodium salt dihydrate from Sigma-Aldrich , accessed on January 20, 2014 ( PDF ).
- ↑ Bo-Long Poh, Chooi Seng Lim, Kong Soo Khoo: A water-soluble cyclic tetramer from reacting chromotropic acid with formaldehyde . In: Tetrahedron Letters . tape 30 , no. January 8 , 1989, pp. 1005-1008 , doi : 10.1016 / s0040-4039 (00) 95302-4 .