Methyl Red AR/ACS pH Indicator 586085 25Gram

PRODUCT CODE 306275 SYNONYMS -- C.I. NO. 13020 CASR NO. (493-52-7) ATOMIC OR MOLECULAR FORMULA C15H15N3O2 ATOMIC OR MOLECULAR WEIGHT 269.30 PROPERTIES Almost insoluble in water. Soluble in alcohol and in acetic acid. PARAMETER LIMIT Description Red, dark red, maroon or violet powder. Solubility Soluble in alcohol and in acetic acid. Identification (UV-VIS Spectrum ) Passes test. Absorption maximum λ 1 (pH 4.5) λ 1 (pH 6.2) 523-526 nm 427-437 nm Absorptivity (on dried sub.) (A1%/1 cm at λ 1 max pH 4.5) (A1%/1 cm at λ 2max pH 6.2) 1330 - 1430 700 - 800 Clarity of alcohol solution Passes test. Visual Transition Interval From pH 4.2 – pink to pH 5.5 - Orange to pH 6.2 - yellow Melting point 179-1820C MAXIMUM LIMIT OF IMPURITY Loss on drying (at 1100C) 5.0%