5919. Metachrome Yellow

Nomenclature

CAS number: 584-42-9
2-Hydroxy-5-[(3-nitrophenyl)azo]benzoic acid monosodium salt; C.I. Mordant Yellow 1; C.I. 14025; alizarine yellow GG; salicyl yellow; sodium m-nitrobenzeneazosalicylate.
C13H8N3NaO5; mol wt 309.21.
C 50.50%, H 2.61%, N 13.59%, Na 7.44%, O 25.87%.

Description and references

Prepd from diazotized m-nitroaniline and salicylic acid in alkaline medium: R. Nietzki, US 424019; Colour Index vol. 4 (3rd ed., 1971) p 4058.

Chemical structure

Properties

Yellow powder. Slightly sol in cold water; more sol in hot water.

Use

Biological stain and acid-base indicator. pH: 10.2 colorless, 12.0 yellow.