الوصف

Identification test Solubility: it is easily soluble in water; extremely difficult to dissolve in ethanol. It can be measured according to the OT**2 method.
Take 2 ml of 2.0% sample solution; add 2 mL of water, 0.1 g sodium bicarbonate and 0.*2 g of ferrous sulfate. Stand after shaking. At this time, it should exhibit dark purple color while addition of 5 mL of dilute sulfuric acid test solution (TS***1) will make the color disappeared.
The burning residue of the sample was dissolved by the water and subject to (TS*2) acidification, and if necessary, subject to filtration. Addition of uranyl zinc acetate test solution (TS***3) should produce yellow crystalline precipitate.
The aqueous solution of the sample allows the discoloration of the 2, *-dichloroindophenol test solution (TS**4).