Synonyms: gaultheria oil, wintergreen oilcas number: 119-36-8, molecular weight: 152.15, chemical formula: c8h8o3, einecs ec number: 204-317-7, fema: ----, methyl salicylate bp gradeph eurc8h8o3 -- 152.1 -- 119-36-860-7action and use: counter-irritant. Definitionmethyl 2-hydroxybenzoate.Content: 99.0 per cent mm to 100.5 per cent mm. Charactersappearance: colourless or slightly yellow liquid.Solubility: very slightly soluble in water, miscible with ethanol (96 per cent) and with fatty and essential oils. Identificationa. Heat 0.25 ml with 2 ml of dilute sodium hydroxide solution on a water-bath for 5 min. Add 3 ml of dilute sulphuric acid. A crystalline precipitate is formed. Filter. The precipitate washed with water and dried at 100c-105c, melts at 156c to 161c.B. To 10 ml of a saturated solution add 0.05 ml of ferric chloride solution. A violet colour develops. Testsappearance of solution: the solution is clear and not more intensely coloured than reference solution.To 2 ml add 10 ml of ethanol (96 per cent).Acidity: dissolve 5.0 g in a mixture of 0.2 ml of bromocresol green solution and 50 ml of ethanol (96 per cent) previously neutralised to a blue colour by addition of 0.1 m sodium hydroxide. Not more than 0.4 ml of 0.1 m sodium hydroxide is required to restore the blue colour.Relative density: 1.180 to 1.186.Refractive index: 1.535 to 1.538. Assaydissolve 0.500 g in 25 ml of ethanol (96 per cent). Add 0.05 ml of phenol red solution and neutralise with 0.1 m sodium hydroxide. To the neutralised solution add 50.0 ml of 0.1 m sodium hydroxide and heat under a reflux condenser on a water-bath for 30 min. Cool and titrate with 0.1 m hydrochloric acid . Calculate the volume of 0.1 m sodium hydroxide used in the saponification. Carry out a blank titration.1 ml of 0.1 m sodium hydroxide is equivalent to 15.21 mg of c8h8o3.
Upington, South Africa
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