Metaphosphate sulphate

Cobalt Metaphosphate, Co(P03)2, is obtained9 by evaporating a mixture of cobalt sulphate and phosphoric acid in a platinum dish, and subsequently heating to 300° C. It is deposited as a beautiful, rose-coloured, anhydrous compound, insoluble in water and dilute acids, but soluble in concentrated sulphuric acid. 

Nickel Metaphosphate, Ni(P03)2.—The anhydrous salt is obtained by the action of phosphoric acid on nickel sulphate at 300° C. It is a yellow substance, insoluble in water and most adds, but attacked by concentrated sulphuric acid. It may be obtained in the crystalline form by melting with metaphosphoric acid. 

At a temperature of 78° C. the velocity constant whether referred to a unimolecular or a bimolecular reaction diminished with time after an hour rather less than three-quarters of the original metaphosphate remains.6 The product is mainly orthophosphate, as was proved by titration with methyl orange and phenolphthalein, although small quantities of pyrophosphate were formed by a side reaction. The pyro-acid was determined by titration to bromophenol blue in the presence of zinc sulphate, which leads to a complete precipitation of pyrophosphate, the ortho-acid being unaffected, thus... 

Cupric pyrophosphate, Cu2P207.—The anhydrous salt is precipitated as a greenish-white powder by addition of sodium pyrophosphate to a solution of a cupric salt.8 The pentahydrate crystallizes from a solution containing cupric sulphate and sodium metaphosphate.9... 

Cupric metaphosphate, Cu(P03)2.—The metaphosphate is formed by evaporating to dryness an aqueous solution of cupric nitrate and ortho-phosphoric acid, and heating the residue at 816° C.10 The tetrahydrate is prepared by precipitating with alcohol a solution of cupric sulphate and sodium metaphosphate.11... 

Maddrell s salt, which are interpreted as showing that kinetic effects are responsible for difficulties in converting the cyclic trimer into the linear polymeric forms. The potassium polyphosphate samples (Kurrol s salt) obtained from the fusion of potassium sulphate and phosphoric acid have chains terminated by OSOJ groups, according to i.r. spectra. Kinetic studies show a first-order dependence of polyphosphate concentration in the hydrolysis of Graham s salt to give trimetaphosphate and short-chain species. The vaporization of sodium metaphosphate from a Knudsen cell leads to predominantly monomeric, with some dimeric, species, according to mass-spectrometric data. ... 

However, Biirker has returned to this conception. According to him, coagulation of the blood is intimately related to the decomposition of the plates. All the conditions which influence thrombin, and consequently coagulation, such as temperature, contact, chemical products, act equally on the transformation of the plates. Sodium metaphosphate, magnesium sulphate, ammonium oxalate, all of which hinder coagulation, also preserve the blood components. This decomposition of the plates would take place under the action of a trypsin contained in the blood. Once these particles are destroyed, coagulation would appear. The quantity of fibrin formed is then in direct proportion to the... 

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