Sodium peroxide 8-hydrate

Hydrates of sodium peroxide may be prepared by (1) the slow evaporation of a cold aqueous solution of sodium peroxide(2) the slow action of water vapor on solid sodium peroxide (3) the electrolysis of aqueous sodium hydroxide at temperatures between —10 and 0°, and (4) precipitation from a cold solution of sodium hydroxide and hydrogen peroxide by means of alcohol.  

The method outlined below is a modification of the last mentioned of these procedures and yields a chemically pure product. The success of this method depends upon the use of an excess of sodium hydroxide, since no precipitate is 

The 8-hydrate is a white, crystalline powder which reacts readily with carbon dioxide, hence must be kept from contact with the atmosphere. It melts in its own water of crystallization at 30 and decomposes to yield oxygen. If kept for a long period over sulfuric acid in a vacuum desiccator, the 8-hydrate loses 6 molecules of water to form the 2-hydrate, Na202-2H20.  

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See also Sodium peroxide 8-hydrate, synthesis 1 Strontium sulfide and sel-enide phosphors, synthesis 4... 

This octahydrate, and the other hydrates and peroxohydrates of sodium peroxide that are known, no longer have commercial significance. 

Natron-hydrat, n. sodium hydroxide, -hydrat-Idsung,/. sodium hydroxide solution, -hyper-oxyd, n, sodium peroxide, -kalk, m, soda lime, -kalkglas, n. soda-lime glass, -kalk-rohr, n., -kalkrohre, /. soda-lime tube. -la.uge, /. soda lye, solution of caustic soda. 

At 45°C 30% hydrogen peroxide (100 mmol) was added dropwise to a solution of the product from Step 5 (40 mmol) dissolved in 100 ml HOAc containing sodium tungstate hydrate (400 mg) and stirred overnight at ambient temperature. The mixture was subsequently poured into ice water, extracted with CH2CI2, washed with sodium sulfite solution, dried over magnesium sulfate, concentrated, and the product isolated in 50% yield, mp = 137-139 °C. 

When iron is attacked by fused sodium peroxide, dark red, tabular crystals of a monohydrate, Fe203.H20, are obtained, of density 3 8 at 27° C. The hydrate is magnetic, and when heated to low redness a magnetic form of anhydrous ferric oxide is obtained.3... 

ETHYL HYDRATE (64-17-5) Forms explosive mixture with air [flash point 55°F/13°C 68°F/20°C (80%) 72°F/22°C (60%) 79°F/26 C (40%)]. Reacts, possibly violently, with strong oxidizers, bases, acetic anhydride, acetyl bromide, acetyl chloride, aliphatic amines, bromine pentafluoride, calcium oxide, cesium oxide, chloryl perchlorate, disulfuryl difluoride, ethylene glycol methyl ether, iodine heptafluoride, isocyanates, nitrosyl perchlorate, perchlorates, platinum, potassium-terr-butoxide, potassium, potassium oxide, potassium peroxide, phosphorus(III) oxide, silver nitrate, silver oxide, sulfuric acid, oleum, sodium, sodium hydrazide, sodium peroxide, sulfinyl cyanamide, tetrachlorosilane, i-triazine-2,4,6-triol, triethoxydialuminum tribromide, triethylaluminum, uranium fluoride, xenon tetrafluoride. Mixture with mercury nitrate(ll) forms explosive mercury fulminate. Forms explosive complexes with perchlorates, magnesium perchlorate (forms ethyl perchlorate), silver perchlorate. Flow or agitation of substance may generate electrostatic charges due to low conductivity. 

Aluminum chlorohydrate Bone black Hypochlorous acid Iron (III) oxide hydrated PoUssium manganate Potassium permanganate Silver Sodium hypochlorite Sodium peroxide water reducer, concrete Sodium gluconate water reducer, concrete moldings Naphthalene-formaldehyde sulfonate water repellent... 

The most common form of sodium peroxide is the octahydrate, Na202 8H2O. Such hydrates, in which the water molecules are for the most part hydrogen-bonded to the peroxide ions, are also common in the alkaline-earth peroxides. 

Oxidation. The oxidation reactions of organoboranes have been reviewed (5,7,215). Hydroboration—oxidation is an anti-Markovnikov cis-hydration of carbon—carbon multiple bonds. The standard oxidation procedure employs 30% hydrogen peroxide and 3 M sodium hydroxide. The reaction proceeds with retention of configuration (216). 

Heterocyclic compounds that have water bound covalently across a C=N bond behave as secondary alcohols. When subjected to very gentle oxidative conditions, they are converted into the corresponding 0x0 compounds. Potassium permanganate in 0. IN sodium hydroxide at room temperature has been used to oxidize 2- and 6-hydroxypteri-dine to 2,4- and 6,7-dihydroxypteridine, respectively. In contrast, 4-hydroxypteridine was not attacked by this reagent even at 100°. Hydrogen peroxide in acid solution was used to oxidize quinazoline quinazoline 3-oxide 1,3,5-, 1,3,7-, and 1,3,8-triazanaphthalene and pteridine (which hydrate across the 3,4-double bond in the... 

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