Metanil Yellow
Title: Metanil Yellow
CAS Registry Number: 587-98-4
CAS Name: 3-[[4-(Phenylamino)phenyl]azo]benzenesulfonic acid monosodium salt
Additional Names: C.I. Acid Yellow 36; m-[(p-anilinophenyl)azo]benzenesulfonic acid sodium salt; sodium salt of metanilylazodiphenylamine; Ext. D & C Yellow No. 1; C.I. 13065
Trademarks: Tropaeolin G
Molecular Formula: C18H14N3NaO3S
Molecular Weight: 375.38
Percent Composition: C 57.59%, H 3.76%, N 11.19%, Na 6.12%, O 12.79%, S 8.54%
Literature References: Prepn: Welcher, Organic Analytical Reagents vol. 4 (Van Nostrand, 1948) p 516; Colour Index vol. 4 (3rd ed., 1971) p 4045.
Properties: Brownish-yellow powder. Sol in water, alc; moderately sol in benzene, ether; slightly sol in acetone.
Use: As indicator in 0.1% soln, of which 2 drops are required for 10 ml liquid. pH: 1.2 red to 2.3 yellow.

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