Sulphuric Acid Diluted

Anhydrous titanium dioxide is only soluble with difficulty in hot concentrated sulphuric acid dilution allows the crystallisation of a sulphate of formula T10S04.H20, but it is doubtful if the titanyl cation TiO actually exists, either in solution or the solid. Certainly [TifHjOIn] does not exist, and solutions of titanyl salts may best be considered to contain ions [Ti(0H)2(H204)] . Titanium... 

Sulphuric Acid, Dilute, i vol. of cone. H2SO4 to 8 vols. of water. 

Dissolve 4.9 g of ammonium iron(II) sulphate heptahydrate in 150 mL of water and add 2.5 mL of concentrated sulphuric acid. Dilute the solution to 500 mL in a graduated flask. 

Sulphuric Acid. — Dilute 4 cc. of nitric acid with 90 cc. of water, and add barium chloride solution. No precipitate of barium sulphate should form on standing twelve hours. 

Substances Oxidizable by Permanganate. (Nitrous and Sulphurous Acids). — Dilute 15 cc. of sulphuric acid with (50 cc. of water, and color the solution by adding 1 drop of decinormal potassium permanganate solution. The pink color should not disappear within three minutes. 

Hydrogen-Halogen Acids. — 2 cc. of sulphuric acid diluted with 30 cc. of water should appear unchanged on adding a few drops of silver nitrate solution. 

Chlorine, bromine, and iodine are generally prepared by heating together a chloride, bromide, or iodide with manganese dioxide and sulphuric acid diluted with water. Here the first change is the formation of the halogen hydride, HC1, HBr, or HI. The hydride, however, is... 

On reacting TNT with metals in the presence of mixtures of nitric and sulphuric acids diluted with water similar products were obtained, although the presence of sulphuric acid inhibited their formation to some extent. These products can be formed in production while TNT is being washed free of acid by water, for when most of the sulphuric acid has been removed, the remaining nitric acid is strongly absorbed by molten TNT. 

The reagent is prepared by dissolving 0-5 g diphenylamine in 85 ml concentrated sulphuric acid diluted to 100 ml with water. 

Sulphuric Acid,Dilute mix carefully 0A%oisulphuric acid with 896 g of water and cool It contains about 10% w/w H SO ... 

Experiment 18.—Supplies Test tubes, granulated zinc, iron filings, dilute sulphuric acid, dilute hydrochloric acid. 

From wulfenite, molybdenum trioxide is prepared by digesting the mineral (previously washed with dilute hydrochloric acid) with concentrated hydrochloric acid lead still remaining in solution after cooling and filtration is removed by the addition of sulphuric acid, and the filtrate is evaporated to dryness with the addition of a small quantity of nitric acid. The ammonia extract of this mass is then subjected to the method of purification previously described. Another method consists in decomposing the finely powdered mineral by means of concentrated sulphuric acid, diluting to precipitate lead sulphate, and evaporating the filtrate until precipitation of molybdic anhydride occurs. ... 

NOTE.—The alcohol to be used in this experiment is now made by the Standard Oil Co. of New Jersey and is available commercially. Secondary alcohols, of the general formula R2CHOH, lose water more readily than primary alcohols, RCH2OH. For this reason sulphuric acid diluted with water can be used. If the concentrated acid is used the unsaturated hydrocarbon is polymerized to di- and tri-amylenes. 

To Kemowe Nitric Acid from Sulphuric Acid. Diluted sulphuric acid... 

Mialhe a loduretted Gaaeous Water. lodido of potassium, 15 grainii bicarbonate of soda, 75 grains water, 1 pint dissolve, and add sulphuric acid diluted with its weight of water, 75 grains. Cork Immediately. 

Cellulose dissolves in concentrated sulphuric acid when the solution is diluted with water and boiled, soluble carbohydrates are formed, which vary in complexity from soluble celluloses and dextrins to dextrose, the final product of hydrolysis. When unsized paper is left in contact for a moment with sulphuric acid diluted with about one-fourth its volume of water, the surface of the paper is converted into a colloidal modification of cellulose called amyloid. After washing in water and dilute ammonia the paper is found to have a smooth surface, and to have been markedly toughened by the treatment. The so-called parchment paper is prepared in this way. Amyloid is colored blue by iodine the reaction is used as a test for cellulose. 

Indicator weigh 0.5 g disulphine blue VN and 0.5 g dimidium bromide in two 50 ml beakers. Add 25 ml hot 10% aqueous ethanol to each and stir until dissolved. Transfer both solutions to a 250 ml volumetric flask, dilute to volume and mix. This is the stock solution. Place 200 ml water and 20 ml stock solution in a 500 ml volumetric flask, add 20 ml 2.5 M sulphuric acid, dilute to volume and mix. This is the acid mixed indicator. 

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