Sodium hydroxide, melting with

In 1861, W. Gossage showed that calcium sulphide is insoluble in water, and is but little attacked by sodium carbonate he also showed that the residue left after the lixiviation of black ash is a mixture of calcium monosulphide and carbonate, even when no sodium sulphide is present in the liquor and that if any sodium sulphide be present in the liquor, it is derived from the formation of calcium polysulphides in the black ash which can be prevented by using an excess of limestone. Both J. W. Kynaston and W. Gossage showed that no sodium hydroxide is present in black ash because (a) sodium hydroxide melted with black ash forms calcium oxide and sodium carbonate and (b) no sodium hydroxide can be extracted with... 

A mixture of 10 g of the above piperazine carboxylate ester, 8 g of phosphorus pentoxide and 20 ml of phosphorus oxychloride is heated under reflux for about 1 day, diluted with 100 ml each of chloroform and benzene and quenched with 200 g of ice. The mixture is made basic with 10% sodium hydroxide. Theorganic layer is Isolated and extracted with 150 ml of dilute hydrochloric acid. The product is precipitated from the aqueous layer by addition of 10% sodium hydroxide, extracted with benzene and dried over potassium carbonate. Recrystallization from benzene-petroleum ether gives 2[Pg.77]

To a slightly warm suspension of 3-acetoxy-7-chloro-5-(o-chlorophenyl)-1 3-dihydro-2H-1,4-benzodiazepin-2-one thus obtained was added 4N sodium hydroxide solution with stirring. All the solid dissolved and soon a thick white solid precipitated out. The solid was filtered, washed well with water and recrystallized from ethanol. The product was isolated as a solvate with 1 mol of ethanol. When heated it loses the ethanol of solvation and melts at 166°C to 168 C. 

The electrolyte salt must be processed to recover the ionic plutonium orginally added to the cell. This can be done by aqueous chemistry, typically by dissolution in a dilute sodium hydroxide solution with recovery of the contained plutonium as Pu(OH)3, or by pyrochemical techniques. The usual pyrochemical method is to contact the molten electrolyte salt with molten calcium, thereby reducing any PUCI3 to plutonium metal which is immiscible in the salt phase. The extraction crucible is maintained above the melting point of the contained salts to permit any fine droplets of plutonium in the salt to coalesce with the pool of metal formed beneath the salt phase. If the original ER electrolyte salt was eutectic NaCl-KCl a third "black salt" phase will be formed between the stripped electrolyte salt and the solidified metal button. This dark-blue phase can contain 10 wt. % of the plutonium originally present in the electrolyte salt plutonium in this phase can be recovered by an additional calcium extraction stepO ). 

The base is acetylated by adding to it an equal weight of acetic anhydride, heating for a short time on the water bath, and then diluting with water. In order to isolate the still basic acetyl-compound the free acetic acid is just neutralised with sodium hydroxide. Melting point of the substance after recrystallisation from water 130°. 

A solution of 23 g. (0.25 mole) of aniline in 250 ml. of 2.5 iV hydrochloric acid is diazotized at 5° by the addition of 17.5 g. (0.25 mole) of sodium nitrite in 100 ml. of water. The resulting solution is added to a solution of 23 g. (0.27 mole) of dicyandiamide in 700 ml. of water at 20°. To this is added 10 N sodium hydroxide until the mixture is strongly alkaline and after it has stood 30 minutes it is acidified with acetic acid. The precipitated triazene (CeHsN NNHCfNHlNHCN) is removed by filtration, washed with water, and partially dried by suction on the filter. The solid is then added (15 minutes) with stirring to a mixture of 200 ml. of -ethoxyethanol and 28 ml. of 10 N hydrochloric acid held at 28-30°. After the mixture has been stirred for 1 hour at this temperature no more nitrogen is evolved and 500 ml. of water is added. The precipitated phenyldicyandiamide is dissolved in 250 ml. of boiling 1 N sodium hydroxide, filtered with activated carbon, and reprecipitated by the addition of dilute hydrochloric acid. The crystalline product weighs 20 g. and after recrystallization from methanol melts at 196-197°. 

Dissolve in hot 2 M HCIO4 or HCl the precipitate containing Zr(OH)4 (either the precipitate which remains undissolved on leaching the sodium carbonate melt with water, or the precipitate obtained from the sample solution with sodium hydroxide). Dilute the cooled solution so as to make the concentration of HCIO4 within 0.8 0.1 M, or of HCl within 0.6 0.1 M. 

The alkali-fuaon process was developed by the Ames Laboratory of the U.S. Atomic Energy Commission [B2] to provide a method for producing zirconium salts that did not need the high temperature of an electric furnace. A flow sheet for this process is shown in Fig. 7.5. In this process, zircon sand is nuxed vrith from 1.0 to 1.5 times its wei t of sodium hydroxide, and the mixture is heated in a furnace at 565°C. The sodium hydroxide melts at 318°C, and as its temperature rises it reacts with the zircon ... 

White, amorphous pieces or powder, d 2.27. Melts at a dull red heat and begins to dec above 400° into sodium par-oxide and metal. It is very reactive and combines violently with water, forming sodium hydroxide. Handle with longs and not with bare hands, and keep tightly closed. 

In a 1-litre three-necked flask, fitted with a mechanical stirrer, reflux condenser and a thermometer, place 200 g. of iodoform and half of a sodium arsenite solution, prepared from 54-5 g. of A.R. arsenious oxide, 107 g. of A.R. sodium hydroxide and 520 ml. of water. Start the stirrer and heat the flask until the thermometer reads 60-65° maintain the mixture at this temperature during the whole reaction (1). Run in the remainder of the sodium arsenite solution during the course of 15 minutes, and keep the reaction mixture at 60-65° for 1 hour in order to complete the reaction. AUow to cool to about 40-45° (2) and filter with suction from the small amount of solid impurities. Separate the lower layer from the filtrate, dry it with anhydrous calcium chloride, and distil the crude methylene iodide (131 g. this crude product is satisfactory for most purposes) under diminished pressure. Practically all passes over as a light straw-coloured (sometimes brown) liquid at 80°/25 mm. it melts at 6°. Some of the colour may be removed by shaking with silver powder. The small dark residue in the flask solidifies on cooling. 

Dissolve 10 g. of lactose (1) in 100 ml. of nitric acid, sp. gr. 115, in an evaporating dish and evaporate in a fume cupboard until the volume has been reduced to about 20 ml. The mixture becomes thick and pasty owing to the separation of mucic acid. When cold, dilute with 30 ml. of water, filter at the pump and set the filtrate A) aside. Wash the crude acid with cold water. Purify the mucic acid by dissolving it in the minimum volume of dilute sodium hydroxide solution and reprecipitating with dilute hydrochloric acid do not allow the temperature to rise above 25°. Dry the purified acid (about 5 g.) and determine the m.p. Mucic acid melts with decomposition at 212-213°. 

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