Pyrocatechol violet/Catecholsulfonphthalein/Pyrocatecholsulfonephthalein/Catechol violet

English Name: pyrocatechol violet; Catecholsulfonphthalein； Pyrocatecholsulfonephthalein； Catechol violet

Other names: catechol violet; Catechol sulfonphthalein; Pyrocatechol violet; Catechol sulfonphthalein; Tea phenol violet; O-diphenol sulfonphthalein

CAS No.: 115-41-3

C19H14O7S=386.38

Grade: ind

Dissolution test: qualified

Loss on drying: ≤ 0.5%

Burning residue (calculated by sulfate): ≤ 0.1%

PH color change range: 5.2 (yellow) ～ 6.8 (purple)

Physicochemical Properties: reddish brown crystalline powder with metallic luster. It is easily soluble in water and ethanol, slightly soluble in absolute ethanol, and insoluble in non-polar solvents (such as ether, benzene, xylene). Its aqueous solution is yellow. When the acidity increases, it changes from yellow to red, the solution above ph6 changes to purple, and the solution above PH9 changes to red purple

Purpose: biochemical research. Complexation indicator. Titrate bismuth, cadmium, cobalt, copper, iron, gallium, indium, magnesium, lead, manganese, nickel, thorium, zinc. Used for photometric determination of bismuth, boron, chromium (III), copper, niobium, antimony, tin, zirconium and thorium. Spray developer of paper chromatography

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