Sodium paraperiodate

C. F. Rammelsberg found that if a soln. of lithium carbonate be nearly neutralized with periodic acid, a crystalline mass is obtained when evaporated in a warm place.5 The crystals have the composition trihydrated lithium dimesoperiodate, Li4l209.3H20, which can also be regarded as secondary sodium paraperiodate, Li2H3I06. They lose no water at 100°, but 9 28 per cent, is lost at 200°, and at 275° oxygen comes off as well. 

Twenty grams of sodium paraperiodate are dissolved in 40ml water and 11ml of concentrated nitric acid is added... 

Sodium periodate, and less frequently potassium periodate, are employed in oxidations which are to be carried out within the pH range 3-5. Sodium metaperiodate (NaI04) has a solubility in water of c. 0.07 g per ml the addition of alkali leads to the precipitation of the far less soluble sodium paraperiodate (Na2H3I06, disodium trihydrogen orthoperiodate, water solubility c. 0.20%). Sodium paraperiodate is available commercially and may be converted into the... 

For each 100 g. of sodium paraperiodate, 200 ml. of water and 55 ml. of concentrated nitric acid (a 50 per cent excess)... 

The basicity of sodium paraperiodate is determined by titration with acid after reduction to iodate by boiling with neutral hydrogen peroxide ... 

The directions for the preparation differ from those for the preparation of sodium paraperiodate only in that 135 g. of potassium chlorate is used and 195 g. of pure potassium hydroxide. Since the latter always contains water, its percentage purity must be known. The yield is nearly 180 g. (98 to 99 per cent), and the purity is 99.5 per cent. 

Silicon, higher chlorides of, 42 Silicon tetrabromide, 38, 40 Silicon tetrachloride, 44 Silicopropane, octachloro, 44 Silicotungstic acid, 129 analysis, 131 ether complex, 131 Silver, metallic, 4 Silver chloride, reduction of, 3 Silver cyanamide, 98 Silver residues, purification of, 2 Sodium amalgam, 10 Sodium amide, 74 Sodium azide, purification of, 79 Sodium azidodithiocarbonate, 82 Sodium butoxide, 88 Sodium hypochlorite (solution), 90 Sodium iodate, 168 Sodium metaperiodate, 170 Sodium paraperiodate, chlorine method, 169 persulfate method, 170 Strontium amalgam, 11 Sulfur hexafluoride, 121 Sulfuryl chloride, 114... 

Nickel (II) fluoride, 3 191 Nickel (IV) potassium paraperiodate J-hydrate, 5 201, 202 analysis of, 5 203 Nickel (IV) sodium paraperiodate 1-hydrate, 5 201... 

Nickel(IV) sodium paraperiodate 1-hydrate (amt.) analysis of, 6 203 Nickel tetracarbonyl, 2 234 Niobium(V) fluoride, 3 179 Nitramide, 1 68, 72 Nitrates, preparation of anhydrous, 5 38... 

Sodium V-nitrosohydroxylamine-V-sulfonate, 5 119 Sodium paraperiodate (orthoperiodate) (Na3H2I06), by chlorine method, 1 169 by persulfate method, 1 170 by sodium iodide-bromine method, 2 212... 

FIGURE 3. C NMR spectra of a cypress log buried in the Okefenokee Swamp, Georgia, a Douglas fir tree that had fallen in the rain forest surrounding Mount Ranier, Washington, and lignin isolated from modern spruce wood by the sodium paraperiodate treatment. 

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