Cesium chloride solution preparation

Cesium chloride is prepared by the treatment of cesium oxide or any cesium salt with hydrochloric acid followed by evaporation and crystallization of the solution. 

All of the samples prepared by centrifugation and the float-sink method were demineralized and milled to three micron diameter. The separations were conducted in the presence of a surface active agent, polyoxyethylene(23) lauryl ether, in cesium chloride solutions (14). The macerals were washed thoroughly to reduce the quantity of surfactant in the maceral to less than 500 ppm and the quantity of chloride ion in the wash water to below the limit detectable by precipitation with silver ion (14). 

When a cesium chloride solution is spun in an ultracentrifuge, a density gradient is formed. The position of DNA in the gradient is determined by its G + C content, which can be calculated from the relative position of a second DNA of known density. Determinations are generally made in an analytical ultracentrifuge, but a preparative ultracentrifuge will also serve for this purpose. 

Prepare three 2-mL cushions of cesium chloride solution in polypropylene tubes see Note 4) for an SW50.1 rotor. Layer 3 mL of the homogenate over each gradient. 

A solution is prepared by dissolving 50.0 g cesium chloride (CsCl) in 50.0 g water. The volume of the solution is 63.3 mL. Calculate the mass percent, molarity, molality, and mole fraction of the cesium chloride. 

Sample Cesium chloride (Nacalai Tesque Co.) was recrystallized from distilled water. Sample solutions were prepared by weight at the concentration of 0.100-5.000 ( 0.(XX)1) mol kg. The molality was converted into the molarity (c) using the density of aqueous CsCl... 

Cesium chloride [7647-17-8] M 168.4, m 645°, b 1303°, d 4 3.99. It is soluble in H2O but can be purified by crystallisation from H2O [solubility in g percent 162.3(0.7°), 182.2(16.2°) and 290(at bp 119.4 )] and dried in a high vacuum. It is soluble in EtOH and is deliquescent, keep it in a tightly closed container. [Donges in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I pp 951-955 1963.] For further purification of CsCl, a concentrated aqueous solution of the practically piue reagent is treated with an equivalent weight of I2 and CI2 is bubbled into the solution until precipitation of CsCy is complete. Recrystallisation yields a salt that is free from other alkali metals. It is then decomposed to pure CsCl on heat-... 

Cesium chloride is used to prepare dense solutions required for isolating cellular components with a centrifuge. A 40.0 wt% solution of CsCl (FM 168.36) has a density of 1.43 g/mL. 

During the processing of pollucite the ground mineral is dissolved and silica and alumina are removed from the solution. Salts of alkali metals are present in the filtrate. The separation of these was once very time consuming, as it had to be done with fractional crystalHzation. Nowadays an ion-exchange technique is used, which makes the separation fast and simple. Cesium hydroxide is prepared from the pure cesium solution, and is the base for cesium chloride, iodide, carbonate and other compounds. Cesium metal is prepared by reduction of cesium chloride with calcium metal. 

Cesium bis pentafluoroethyl]trifluorotellurate(IV) was prepared similarly3. The bis[tri-fluoromethyl]trichlorotellurates were similarly obtained from bis[trifluoromethyl]tellurium dichloride and the metal chlorides in acetonitrile at — 5°. The correspondings bi trifluoro-methyl]tribromotellurates(TV) were detected in solution by 19F-NMR spectroscopy but could not be isolated2. 

The [RhClJ2- ion is very reactive in solution, and rapidly oxidizes coordinated chlorides to chlorine this reaction has not been thoroughly studied, but 85-88% of the anticipated Cl, has been recovered, and the Rh-containing product is presumably an aquachlororhodium(III) anion.1238 Attempts to prepare salts other than cesium have not been successful,1237 presumably because of the rapid internal redox reaction which occurs in solution the rapid precipitation of the insoluble Cs salt lessens this contamination. 

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