Schweitzer’s reagent

Cellulose. This is insoluble in water, hot and cold. It dissolves in a solution of Schweitzer s reagent (precipitated cupric hydroxide is washed free from salts and then dissolved in concentrated ammonia solution), from which it is precipitated by the addition of dilute acids. Cellulose is not hydrolysed by dilute hydrochloric acid. 

Schweitzer s reagent (dissolves cotton, linen, and silk, but not wool) add NH4CI and NaOH to a solution of copper sulfate. The blue precipitate is filtered off, washed, pressed, and dissolved in ammonia (sp. gr. 0.92). 

Schweitzer s reagent chem An ammoniacal solution of cupric hydroxide used to dissolve cellulose, silk, and linen, and to test for wool. shvTt-sorz re,a- 3nt scopoline orgchem CgHijOjH A white crystalline alkaloid that melts at 108-109°C, soluble in water and ethanol used in medicine. Also known as oscine. sko-p3,len ... 

Most linear celluloses may be dissolved in solvents capable of breaking the strong hydrogen bonds. These solutions include aqueous solutions of inorganic acids, calcium thiocyanate, zinc chloride, lithium chloride, ammonium hydroxide, iron sodium tartrate, and cadmium or copper ammonium hydroxide (Schweitzer s reagent). The product precipitated by the addition of a nonsolvent to these solutions is a highly amorphous, regenerated cellulose. 

Cellulose dissolved in Schweitzer s reagent (cuprammonium) demonstrates strong laevo-rotatory optical activity. The optical activity of cellulose solutions differing in origin and of different morphological structure is the same. 

SCRAPE THE MOIST CUPRIC HYDROXIDE INTO A GLASS. ADD STRONG AMMONIA (27%, FROM DRUG STORE) BY THE DROP UNTIL ALL Cu(OH), HAS DISSOLVED AND HAS BECOME DEEP-BLUE Cu(NHJ),(OH)1. THIS SOLUTION IS CALLED SCHWEITZER S REAGENT."... 

Cellulose dissolves in Schweitzer s reagent, an ammoniacal solution of cupric oxide. After treatment with an alkali, ibe addition of carbon disulfide causes formation of sodium xanihate. a process used in the production of rayon. Sec also Fibers. The action of acetic anhydride in the presence of sulfuric acid produces cellulose acetates, the basis for a line of synthetic materials. See also Cellulose Ester Plastics (Organic). Nitrocelluloses are produced hy ihc action of nitric acid and sulfuric acid on cellulose, yielding compounds that are highly flammable and explosive. See also Explosives. 

SCHWEITZER S REAGENT. A solution of copper hydroxide in strong ammonia used in analytical chemistry as a test for wool. It dissolves cotton, silk, and linen. 

Cellulose is insol in w, ale, eth all known simple org solvs. The best solv for it is cuprammonium hydroxide, [Cu(NH3)4(OH)2], also called Schweitzer s Reagent. It is also sol in a coned soln of Ca thiocyanate alone or in combination with formaldehyde. Other solvs gelatinizers for cellulose include zinc chloride (in 40% soln on heating), basic beryllium perchlorate, 84% phosphoric acid, selenic acid, arsenic acid, sulfurous acid, 66% HBr, 70-75% HF, coned HI, chloral with pyridine, chloral hydrate in H2S04, and inorg salts(such as NaCl) in coned solns at high temps. Coned solns of NaOH at ca -10° only partially dissolve cellulose while the remainder is swelled "mercerized . 

Schweitzer s Reagent.—Chemically it is an inert compound wholly insoluble in water, most neutral reagents and in dilute acids or alkalies under ordinary conditions. It is probable that no solvent dissolves cellulose without decomposition or hydration. The solvent most commonly used is an ammoniacal solution of copper oxide made by dissolving freshly precipitated copper hydroxide in ammonium hydroxide. This solution is known as Schweitzer s reagent. After solution in this reagent acids reprecipitate the cellulose as a hydrated cellulose. 

The cuticular cellulose is insoluble in Schweitzer s reagent, which is a solution of copper hydroxide in ammonia. The bulk of the cellulose... 

Mercerized cotton is more easily acted upon by chemicals than ordinary cellulose. It dissolves more readily in Schweitzer s reagent and does not... 

The cell walls are thick and swell uniformly without showing globular variation in thickness when treated with Schweitzer s reagent. From this it... 

USE In nianuf of rayon, battery electrodes, other Cu salts as mordant in dyeing as pigment in fungicides, insecticides as feed additive in treating and staining paper in prepn of Schweitzer s reagent in catalysts. 

Cupric oxide, ammoniacal Schweitzer s reagent (dissolves cotton, linen, and silk, but not wool). 

Cellulose dissolves in Schweitzer s reagent, which is prepared by dissolving carefully washed precipitated copper hydroxide in ammonia. From this solution it is precipitated iii an amorphous condition by acids and salts. Advantage is taken of the effect of this reagent on cellulose in the preparation of waterproof paper. A sheet of paper left for a short time in contact with Schweitzer s reagent is superficially attacked, and when passed through rollers and dried is rendered impervious to water. 

Schiff s reagent Schweitzer s reagent Iodine solution Tannic acid (10% soln.)... 

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