Difference between revisions of "Alizarin blue"
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Alizarine blue crystallizes in brownish-violet needles from a benzene solution. When prepared in a saturated alcoholic solution, alizarin blue is used as an acid-base indicator. It changes from pink at pH 0.0 to yellow at pH 2.6. It also changes from yellow at pH 6.0 to green at pH 7.6. | Alizarine blue crystallizes in brownish-violet needles from a benzene solution. When prepared in a saturated alcoholic solution, alizarin blue is used as an acid-base indicator. It changes from pink at pH 0.0 to yellow at pH 2.6. It also changes from yellow at pH 6.0 to green at pH 7.6. | ||
| − | See also [ | + | See also [[alizarin|alizarin]]. |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
Revision as of 09:28, 7 January 2014
Description
Alizarine blue crystallizes in brownish-violet needles from a benzene solution. When prepared in a saturated alcoholic solution, alizarin blue is used as an acid-base indicator. It changes from pink at pH 0.0 to yellow at pH 2.6. It also changes from yellow at pH 6.0 to green at pH 7.6.
See also Alizarin.
Synonyms and Related Terms
5,6-dihydroxynaphtho[2,3-f]-quinoline-7,12-dione; 7,8-dihydroxy-5,6-phthaloquinoline; CI 67410; bleu d'alizarine (Fr.); blu d' alizarina (It.); azul de alizarina (Port.); Alizarine Blue R;
Other Properties
Soluble in glacial acetic acid, amyl alcohol and hot benzene. Slightly soluble in ethanol, ether and cold benzene. Insoluble in water.
| Composition | C17H9NO4 |
|---|---|
| Melting Point | 268-270 |
| Molecular Weight | 291.25 |
Authority
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- The Merck Index, Susan Budavari (ed.), Merck Research Labs, Whitehouse Station, NJ, 12th Edition, 1996 Comment: entry 234