Sodium hydroxide, granular

HYDROXIDE, dry pOp SODIUM HYDROXIDE, flake pop SODIUM HYDROXIDE, granular pOp SODIUM HYDROXIDE, soUd pop SODIUM (HYDROXYDE de) (FRENCH) WHITE CAUSTIC... 

Sodium Hydroxide, granular Sodium Sulfate Carboxymethyl Cellulose... 

CAUSTIC SODA, GRANULAR CAUSTIC SODA, LIQUID CAUSTIC SODA, SOLID CAUSTIC SODA, SOLUTION LEWIS-RED DEVIL LYE LYE SODALYE SODIUM HYDRATE SODIUM HYDROXIDE, BEAD SODIUM HYDROXIDE, DRY SODIUM HYDROXIDE, FLAKE SODIUM HYDROXIDE, GRANULAR SODIUM HYDROXIDE, SOLID WHITE CAUSTIC... 

Place the distillate in a separating-funnel and extract the benzonitrile twice, using about 30 ml. of ether for each extraction. Return the united ethereal extracts to the funnel and shake with 10% sodium hydroxide solution to eliminate traces of phenol formed by decomposition of the benzenediazonium chloride. Then run off the lower aqueous layer, and shake the ethereal solution with about an equal volume of dilute sulphuric acid to remove traces of foul-smelling phenyl isocyanide (CaHjNC) which are always present. Finally separate the sulphuric acid as completely as possible, and shake the ether with water to ensure absence of acid. Run off the water and dry the benzonitrile solution over granular calcium chloride for about 20 minutes. 

Starch oxidation was investigated as early as 1829 by Liebig. The objective, as with other modifications, was to obtain a modified granular starch. The oxidant commonly employed is sodium hypochlorite, prepared from chlorine and aqueous sodium hydroxide. This reaction is exothermic and external cooling must be provided during preparation of the oxidant. 

Interaction is exothermic, and if air is present, incandescence may occur with freshly prepared granular material. Admixture with oxygen causes a violent explosion [1], Soda-lime, used to absorb hydrogen sulfide, will subsequently react with atmospheric oxygen and especially carbon dioxide (from the solid coolant) with a sufficient exotherm in contact with moist paper wipes (in a laboratory waste bin) to cause ignition [2], Spent material should be saturated with water before separate disposal. Mixture analogous to soda-lime, such as barium hydroxide with potassium or sodium hydroxides, also behave similarly [1],... 

If the reduction has been carried out in ether, the ether layer is separated after the acidification with dilute hydrochloric or sulfuric acid. Sometimes, especially when not very pure lithium aluminum hydride has been used, a gray voluminous emulsion is formed between the organic and aqueous layers. Suction filtration of this emulsion over a fairly large Buchner funnel is often helpful. In other instances, especially in the reductions of amides and nitriles when amines are the products, decomposition with alkalis is in order. With certain amounts of sodium hydroxide of proper concentration a granular by-product - sodium aluminate - may be separated without problems [121],... 

In an apparatus similar to the one described in Preparation 3-1, a mixture of 10 gm (0.041 mole) of 2,2 -dinitrobiphenyl, 133.4 ml of absolute ethanol, and 13.4 ml of aqueous solution containing 10 gm of sodium hydroxide is warmed, with stirring, on a water bath to 70°-80°C. At that temperature 30 gm (0.46 gm-atom) of 30 mesh granular zinc is added over a i hr period. After the addition has been completed, warming between 70°C and 80°C is continued for an... 

Zinc Metarsenite, Zn(As02)2, is obtained as a granular white powder by dissolving arsenious acid in sodium hydroxide solution, making just acid to phenolphthalein with dilute sulphuric acid and adding hot zinc sulphate solution.11 It is also formed when aqueous arsenious acid is mixed with a solution of zinc acetate in dilute acetic acid. 

After the solution has been cooled, 100 ml. of 4 N hydrochloric acid is added and the solution is evaporated to dryness under reduced pressure (water pump) from a water bath the receiver is cooled in an ice bath. The pale yellow syrupy residue (or crystalline solid) is dissolved in 60-75 ml. of water, and the organic base is liberated by the addition of 50 ml. of 18 N sodium hydroxide solution. The upper (organic) phase is separated, and the lower (aqueous) phase is extracted with two 30-ml. portions of benzene. The combined organic base and benzene extracts are dried over 10 g. of anhydrous granular potassium carbonate (Note 3). After the benzene has been distilled slowly under slightly reduced pressure from a 125-ml. Claisen flask, the pressure is lowered further, and the product is distilled. The yield of colorless /3-phenylethyl-dimethylamine boiling at 97-98°/22 mm. (Note 4) is 22-24.7 g. (74-83%) (Note 5). 

Reaction Mixtures. Wear butyl rubber gloves, laboratory coat, and eye protection. In the fume hood behind a shield, cautiously and slowly carry out the following procedure. Treat the stirred reaction mixture from n grams of lithium aluminum hydride by successive dropwise addition of n mL of H20, n mL of 15% sodium hydroxide solution and 3n mL of H20. This produces a granular precipitate that is removed by filtration and treated as normal refuse. Wash the filtrate into drain.17... 

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