DIMETHYL YELLOW pH Indicator grade

Short Name: DIMETHYL YELLOW

Other Names: p-Dimethylaminoazobenzene, 4-Dimethylaminoazobenzene, N,N-Dimethyl-4-phenylazoaniline, N,N-Dimethyl-4-aminoazobenzene, Butter Yellow, Solvent Yellow 2

C.I.No.11020

Chemical Specifications

Appearance : Yellow to orange brown powder

Melting point : 110 - 116°C

Transition range pH 2.9 to pH 4.0 : Red to yellow

Appearance of solution : 0.1% solution in ethanol is clear

Absorption maxima in ethanol : 403 - 407 nm

Specific absorptivity A 1%/1cm (λmax; 0.005%; ethanol; calculated on dried substance) : 1100 - 1300

Loss on drying (40°C; 1 hpa) : Max. 5.0%