Neutral red
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Description
A dark green powder that dissolves in Water or ethanol to form a red solution. Neutral red is used as an indicator for alkalinity of water and Urea. It is red below pH 6.8 and yellow above pH 8.0. It is also used to prepare neutral red indicating paper.
Synonyms and Related Terms
toluylene red; neutral red chloride; nuclear fast red; Michrome no. 226; 3-amino-7-(dimethylamino)-2-methylphenazine monohydrochloride; Basic Red 5; CI 50040
Risks
- Contact may cause irritation.
- Fisher Scientific: MSDS
Physical and Chemical Properties
- Soluble in water, ethanol producing a red color. Insoluble in xylene.
- Absorption max. = 533 nm
| Composition | C15H17ClN4 |
|---|---|
| CAS | 553-24-2 |
| Melting Point | 290 C |
| Molecular Weight | mol. wt. = 288.77 |
Resources and Citations
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 6571