Methyl Orange

Methyl Orange 1.Photo: Molecular Formula: C14H14N3NaO3S Molecular Weight: 327.33 2.Properties:Porperties:Orange yellow or piece crystal, soluble easily in hot water,water solution is gold yellow,insoluble in alcohol. 3. ItemIndPH Colour change range3.0(red)-4.4(yellow)Soluble in waterPasses testSulfated ash,percent18.5-22.0Sensitivity testPasses testOxidePasses test 4.Describe: 1).Orange-yellow powder used as an acid–base indicator in chemical tests, and as a stain in the preparation of slides of biological material. In solution, its colour changes with ; below pH 3.1 it is red, above pH 4.4 it is yellow. 2).Methyl orange is a frequently used in titrations. It is often used in titrations because of its clear colour change. Because it changes colour at the pH of a mid-strength acid, it is usually used in titrations for acids. Unlike a , methyl orange does not have a full spectrum of colour change, but has a sharper end point.