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METHODS OF ANALYSIS
DETERMINATION OF MANGANESE
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ABSENCE OF TUNGSTEN acid are added action ceases ammonia ammonium persulphate asbestos barium hydroxide beaker blank carbon chloride chromium cobalt contents cubic centi cubic centimeters described dimethylglyoxime dioxide dish ferric ferrous sulphate filter paper Five grams five minutes flask fumes of sulphur grams grams of sodium GRAVIMETRIC METHOD heat is applied hot water hydrochloric acid 1:1 hydrogen sulphide ignited and weighed iodate manganese molybdenum nickel nitric acid 1.20 nitric-sulphuric acid normal solution number of cubic oxide oxygen pink color potassium cyanide potassium cyanide solution potassium iodide potassium permanganate reductor removed by filtration residue sample are transferred silica silver nitrate silver nitrate solution sodium chlorate sodium hydroxide sodium thiosulphate solution are added solution is boiled solution is diluted solution is evaporated solution is filtered solution is heated Solutions Required steel stirred stopper sulphate solution sulphuric acid 1:1 titanium titration tungstic acid vanadium volume VOLUMETRIC METHOD weight zinc