Barium iodate 1-hydrate

Barium iodate 1-hydrate in granular form is obtained by the reaction in solution of barium ion with iodate ion formed by the slow reduction of periodic acid by lactic acid at room temperature. Periodic acid is a specific oxidant for glycols and a-hydroxy aldehydes, ketones, and acids, but the rate of oxidation is very slow for a-hy-droxy acids. Thus the barium iodate 1-hydrate crystals are slowly formed from a dilute solution of iodate ion which is being formed as a reaction product. 

Barium nitrate, 3.75 g. (0.0143 mol), potassium metaperiodate (tetraoxoiodate(VII)), KIO4, 5.80 g. (0.0256 mol), and 85% lactic acid, 100 ml. (all reagent grade) are added to 2 1. of distilled water at room temperature in a 

190 X lOO-mm. crystallizing dish. The solution is stirred until all the crystals dissolve, as they do with difficulty then the dish is covered and allowed to stand at room temperature for 48 hours. Crystals begin to form in several hours and grow to 0.015 cm. and larger in size as shown by retention of a large portion of the product on a 100-mesh sieve screen. The yield is about 5.2 g. or 82% of theoretical, based on the potassium metaperiodate if the solubility of barium iodate is taken into account, the yield is probably over 90%. Barium nitrate is present in excess of the equivalent amount so that at the beginning the solution is nearly saturated with the two salts. 

The product obtained consists of compact single crystals having a relatively small surface area per unit weight. No loss in weight occurred after washing a sample three times each with ethanol and ethyl ether, followed by 

Solutions of barium iodate thermally equilibrated with excess barium iodate monohydrate by stirring approximately one hour in a constant-temperature bath were titrated with 0.01043 N thiosulfate solution after reaction with excess potassium iodide in acid solution. Solubilities in grams per liter calculated from four or more determinations at each temperature were as follows 20°, 3.70 X 10 25°, 4.25 X 10- 30°, 4.83 X lO 35°, 5.42 X 10 The increase in solubihty is very nearly linear with increase in temperature. The solubility product constant for temperatures between 20 and 35° can be found from the equation. 

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Barium iodate 1-hydrate, synthesis 4 Indium(I) bromide, synthesis 6 Hexachlorodisiloxane, synthesis 7 Trichlorosilanethiol, synthesis 8 Tris(acetylacetonato)silicon chloride, synthesis 9 Titanium(III)chloride, synthesis 11 Bis[tris(acetylacetonato)titanium(IV)] hexachloro-titanate(IV), synthesis 12 Zirconium(IV) iodide, synthesis 13 (Triphenyl) aminophosphonium chloride, synthesis 19 (Dimethylamido)phosphoryl dichloride, synthesis 20 Bis(dimethylamido)phosphoryl chloride, synthesis 21 Trimeric and tetrameric phosphonitrilic bromides, synthesis 23 Phosphorus(V) chloride-boron trichloride complex, synthesis 24... 

A solution of 12g of barium chloride 2-hydrate in 100ml of water is mixed with 22g of potassium iodate (or 20g of the sodium salt) in an equal volume of boiling water. The resulting mixture is cooled thoroughly in an ice bath and suction-filtered. The residue is washed twice with 25ml of cold water and dried in warm air. 

The preparation and properties of barium monofluorotrioxiodate, BalOsF, have been described. This sparingly soluble salt was prepared by the reaction of the hydrated hydroxide Ba(0H)2,2H20 with the compound IVIO2F2 in alcohol, and was characterized by X-ray diffraction and i.r. and Raman spectroscopy. The lOsF " ion has three oxygen atoms equidistant from iodine, and, for this reason, easily breaks down in aqueous solution to iodate and fluoride. ... 

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