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Practical work in the industrial organic laboratory
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100 per cent 50 grams a-naphthylamine acid solution addition alcohol Alizarin alkali amines amino group ammonia aniline anthraquinone apparatus autoclave Azo dyes Azo Azo dyes chrome Azo dyes lake benzene blue cent sulfuric acid chloride color concentrated hydrochloric acid concentrated sulfuric acid condenser Congo red cooled coupling reaction crystals diazo compound diazotized dilute dissolved distillation dried dyes Azo dyes filtered filtrate flask formed Frdl grams grams of pure grams of soda H acid hydrochloric acid iron isomers laboratory liquid material melting point mixed mixture is heated mole mother liquor naphthalene naphthol neutral nitric acid nitro nitrobenzene obtained oleum oxidation phenol precipitate preparation pressure reaction mixture reduction separated SO,H SO3H soda ash sodium hydroxide sodium nitrite sodium sulfide soluble solvent steam stirrer sulfate sulfide sulfo group sulfonic sulfuric acid Technical Observations temperature theoretical amount tion Triphenylmethanes tube Vat dyes washed yellow yield