Hydrogen iodate, preparation

Preparation and standardization of sodium thiosulfate/phenylarsine oxide solution 0.025 M dissolve 6.205 g sodium thiosulfate (Na C 5 H20) or 4.200 g phenylarsine oxide (C6H5 As = 0) [PAO] in distilled water. Add 0.5 g NaOH solid and dilute to 1 L. Standardize against potassium bi-iodate (potassium hydrogen iodate) solution as described below. 

Fluorescein (147) is prepared by the same route as Pigment Red 90 (see p. 575). The compound is iodized with iodine and potassium iodate in an acidic medium. The iodic acid reoxidizes the resulting hydrogen iodide back to iodine ... 

Iodine trichloride.—This compound was discovered by J. L. Gay Lussac as the result of treating warm iodine or iodine monochloride with an excess of chlorine. The trichloride collects as a citron-yellow crystalline sublimate on the cooler parts of the vessel. It is also formed by the action of liquid chlorine on iodine, or an iodide—say lead iodide.18 The iodine trichloride is almost insoluble in liquid chlorine, and hence, say Y. Thomas and P. Dupuis, this method of preparation is very convenient. It is also formed by the action of dry chlorine on hydrogen iodide (A. Christomanos) silver iodate (J. Krutwig) or methyl iodide (L. von... 

Besides the compact membrane catalysts described in Section II, there are two types of composite membrane catalyst porous and nonporous. Composite catalyst consists of at least two layers. The first bilayered catalyst was prepared by N. Zelinsky [112], who covered zinc granules with a porous layer of palladium sponge. The sponge became saturated with the hydrogen evolved during hydrochloric acid reaction with zinc and at room temperature actively converted hydrocarbon iodates into corresponding hydrocarbons. 

The preparation of iodine involves reduction of iodate ion from NaI03 with sodium hydrogen sulfite, NaHSOj. 

III A) 1931 Bray, W. C., Caulkins, A. L. Reactions Involving Hydrogen Peroxide, Iodine and Iodate Ion II. The Preparation of Iodic Acid. Preliminary Rate Measurements. J. Amer. Chem. Soc. vol. 53, 44-48... 

Prepare a solution 0.02 M in potassium iodate (A) and another solution 0.02 M in sodium hydrogen sulphite (B). Mix the following suggested volumes of A and B and msdce up to 100 cm (where applicable), adding a few drops of 1% starch solution. 

This solid can be prepared by the reaction of potassium hydrogen sulphate with barium iodate and discarding the precipitated barium sulphate. Its purity can be assessed by titration with a standard alkali. 

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