Preparation of Barium Peroxide

Mitkevich, Preparation of Barium Peroxide From Hydrogen Peroxide and Barium Hydroxide , KhimPromUkr (6), 17-19 (1968) CA... 

Chlorine, bromine and iodine form halic(V) acids but only iodic(V) acid, HIO3, can be isolated. Solutions of the chloric) V) and bromic) V) acids can be prepared by the addition of dilute sulphuric acid to barium chlorate(V) and bromate(V) respectively, and then filtering (cf. the preparation of hydrogen peroxide). These two acids can also be prepared by decomposing the corresponding halic(I) acids, but in this case the halide ion is also present in the solution. 

Preparation. Pour 20 ml of a 5% sulphuric acid solution into a 50-ml flask and cool it to 0 °C. While shaking the contents of the flask during 5-10 min, add about 1 g of barium peroxide in small portions. Filter the obtained hydrogen peroxide solution from the precipitate. Study the properties of hydrogen peroxide. 

Prepare an incendiary mixture by shaking 5 g of an aluminium powder and 15 g of barium peroxide in a jar. (2 o not triturate the mixture in a mortar ) Spill the incendiary mixture into the hollow made in the reaction mass and insert a magnesium ribbon cleaned of oxide. Place the crucible on a pan and spill dry sand over it from all sides. Ignite the magnesium ribbon with a burning splinter insert-... 

Barium Pyrovanadate, BaaVaO is precipitated on addition of barium chloride to a solution of sodium pyrovanadate or of other vanadates in the presence of ammonia.3 It has more recently been prepared by the action of barium peroxide on vanadium pentoxide.4 It is a white, amorphous powder which melts above 868° C.5... 

One method of preparation consists in a modification of the Goldschmidt process. Niobium pentoxide is mixed with an alloy of the rare earths, called mixed metal, obtained in the manufacture of thorium nitrate, and consisting roughly of 45 per cent, of cerium, 20 per cent, of lanthanum, 15 per cent, of didymium, and about 20 per cent, of other rare-earth metals. The reaction is carried out in a magnesia-lined crucible, and is started with a firing mixture of barium peroxide, potassium chlorate, and aluminium powder. Considerable evolution of heat takes place and the reduction is extremely rapid a button of niobium is obtained 4 which, however, is not pure. 

In the presence of a strong acid, the 022- ion combines with two protons, yielding hydrogen peroxide, H202. For example, aqueous solutions of H202 are conveniently prepared in the laboratory by reaction of barium peroxide with a stoichiometric amount of sulfuric acid ... 

In the following preparation crude barium peroxide is treated with hydrochloric acid to obtain a solution of hydrogen peroxide. Crude barium peroxide invariably contains a little iron which appears in the solution as FeCla. The iron, however, is completely precipitated as the insoluble hydroxide if an excess of barium peroxide is used. The peroxide hydrolyzes, making the solution basic. 

Hydrogen Peroxide (H2O2). Hydrogen peroxide can be prepared by the reaction of barium peroxide and sulfuric acid (see equation 13). As barium sulfate precipitates out, hydrogen peroxide is easily separated. 

An early study reported the use of barium peroxide for the preparation of 3,4-dimethylbenzene sulphonic acid from the sulphinic acid276. However, the synthetic utility of this reaction has not been reported to date. 

Hydrogen peroxide can be prepared by reaction of barium peroxide with aqueous sulfuric acid. Write a balanced equation representing this reaction. 

Hydrogen peroxide, H2O2, has many applications. For example, it is used as an antiseptic and also as a bleach during hair-coloring. Hydrogen peroxide may be prepared by the reaction of barium peroxide with sulfuric acid, which produces a precipitate of barium sulfate (which may be easily filtered) and a concentrated solution of hydrogen peroxide. Write the imbalanced chemical equation for this process. 

Hydrogen peroxide was first made in 1818 by J. L. Thenard who acidified barium peroxide (p. 121) and then removed excess H2O by evaporation under reduced pressure. Later the compound was prepared by hydrolysis of peroxodisulfates obtained by electrolytic oxidation of acidified sulfate solutions at high current densities ... 

Bentzinger, von R. et al Praxis Naturwiss. Chem., 1987, 36, 38 A priming mixture of magnesium powder and barium peroxide to ignite thermite mixture was to be prepared, but as no barium peroxide was available, sodium peroxide was used instead. Some time after preparation, the mixture ignited spontaneously, because sodium peroxide, unlike barium peroxide, is very hygroscopic and forms hot cone, hydrogen peroxide from contact with atmospheric moisture. See Carbon dioxide, etc., above... 

Takiyama (6) prepared highly monodispersed spindle-type particles of barium sulfate (BaS04) by decomposing the Ba-EDTA complex with hydrogen peroxide. In this reaction, the initial concentration of the Ba-EDTA complex is a decisive factor in separation of nucleation and growth stages. 

Dihydroxo-tetrammino-platinic Chloride, [Pt(NH3)4(OH)2]Cl2, is prepared by the action of hydrogen peroxide on tetrammino-platinous chloride, or by decomposing the sulphate of the series with barium chloride. It crystallises in colourless monoclinic plates. 

K. G. Thurnlackh and K. F. von Hayn prepared a mixed soln. of potassium chlorate and chlorite by the action of potassium hydroxide free from chlorine on a soln. of chlorine dioxide. Light was carefully excluded, and the soln. was evaporated in vacuo at 45°-50°—potassium chlorate separated out first, and after further evaporation, alcohol was added, and the clear alcoholic soln. evaporated. Needle-like crystals of potassium chlorite, KC102, were obtained which deliquesced on exposure to air. As already indicated in connection with the preparation of the acid, G. Bruni and G. Levi made the potassium chlorite by reducing a soln. of potassium chlorate with oxalic acid and A. Reychler, sodium chlorite, by the action of chlorine dioxide on a soln. of sodium peroxide. Sodium chlorite, NaClQ2, can be also made by double decomposition by treating a soln. of barium chlorite with sodium sulphate and evaporating the clear soln. in vacuo. 

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