Manganese Chloride Peroxide

The goods are treated with manganese chloride, and then passed through an alkaline bath whereby manganous oxide is precipitated on the fibre. A subsequent oxidation by air or by a bath of chloride of lime serves to convert this into peroxide, a bottom of the so-called manganese-bronze being obtained. On passing into an acid solution of aniline, aniline black is precipitated on the fibre in a firmly adherent condition. 

When combined with oxidizers such as chlorates, bromates, peroxides, persulfates, and chromium trioxide and subjected to impact, percussion, or heating, powdered zinc explodes. Explosion may result when the powder metal is heated with manganese chloride, hydroxylamine, ammonium nitrate (an oxidizer), potassium nitrate (an oxidizer), sulfur, or interhalogen compounds. Zinc bums in fluorine and chlorine (moist), and reacts with incandescence when mixed with carbon disulfide. 

Preparation of Manganese(IV) Oxide Sol. Add a 2% hydrogen peroxide solution to 5 ml of a potassium permanganate solution containing 14 g of salt per litre of solution until the violet colour disappears. Write the equation of the reaction. To determine the end of the reaction, proceed as follows add a few drops of a saturated sodium chloride solution to a small sample and heat it. If a violet colour is noticeable, add more hydrogen peroxide solution to the main solution. 

Chlorides Calcium and Alkalies. — The tests are to be carried out as detailed under lead peroxide free from manganese. 

Bhattacharjee369, who has brominated acetanilide suspended in aqueous solution of potassium bromide and hydrogen peroxide in presence of vanadium pent oxide catalyst. Chloroperoxidase has been mimicked using supported manganese phorphyrin catalyst in the oxychlorination of dimedone370 and by clay-supported iron(III) chloride in the oxy-chlorination of toluene and anisole371. The kinetics and mechanism of the haloper-oxidases have been studied extensively372,373. 

After filtration, addition of sodium sulphide to the clear solution effects the precipitation of the three metals, cobalt, nickel, and manganese, as sulphides. Digestion with the calculated quantity of ferric chloride oxidises the manganese sulphide to sulphate, which passes into solution. The residue consists of cobalt and nickel sulphides, which are washed and converted into their soluble sulphates by roasting. The sulphates are extracted with water, and converted into chlorides by addition of calcium chloride solution. Their separation is effected g.s follows The requisite fraction of the chloride solution is precipitated with milk of lime, and the insoluble hydroxides of nickel and cobalt thus obtained are oxidised to the black hydroxides by treatment with chlorine. The. washed precipitate is then introduced into the remainder of the chloride solution, and the whole is well stirred and heated, when the black hydrated oxide of nickel passes, into solution, displacing tlm Remainder of. the cobalt from the solution, into. the precipitate.. The final product is thus a suspension of hydrated peroxide.of cobalt,in p. solution of nickel chloride, from which idle cobalt precipitate is removed by filtration, washed, and ignited, to the black oxide. 

This may be identified (a) by its odour (cautiously smell the vapour after removing the test-tube or small beaker from the flame) (b) by the formation of white fumes of ammonium chloride when a glass rod moistened with concentrated hydrochloric acid is held in the vapour (c) by its turning moistened red litmus paper blue or turmeric paper brown (d) by its ability to turn filter paper moistened with mercury(I) nitrate solution black (this is a very trustworthy test ) and (e) filter paper moistened with a solution of manganese(II) chloride and hydrogen peroxide gives a brown colour, due to the oxidation of manganese by the alkaline solution thus formed. 

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