Methylene blue

Methylene blue 1.Photo: Molecular Formula:C16H18CLN3S·3H2O Molecular Weight:373.90 According Q/SS·62-2007 2.Properties:Bottle green crystal or crystalline powder,with gunmetal shine,without smell,solve in water,ethanol and chloroform,insolve in aether,water liquor is blue. 3. Item Ind Assay,percent ≥ 98 Colour change range Passes test Soluble in ethanol Passes test Loss on drying,percent ≤ 15.0 Sulfated ash,percent ≤ 0.5 Arsenic (As),percent ≤ 0.005 Copper (Cu),percent ≤ 0.03 Zinc(Zn),percent ≤ 0.02 4.Describe: Methylene blue is widely used as a redox indicator in analytical chemistry. Solutions of this substance are blue when in an oxidizing environment, but will turn colorless if exposed to a reducing agent. The redox properties can be seen in a classical demonstration of chemical kinetics in general chemistry, the "blue bottle" experiment. Typically, a solution is made of dextrose, methylene blue, and sodium hydroxide. Upon shaking the bottle, oxygen oxidizes methylene blue, and the solution turns blue. The dextrose will gradually reduce the methylene blue to its colorless, reduced form. Hence, when the dissolved oxygen is entirely consumed, the solution will turn colorless.