Nitrates, fused

AH° was found to be 27 kcal. and AS was 27 e.u. The large size of the constant compared with the known dissociation of pure sodium carbonate to sodium oxide and carbon dioxide suggests that NO4"3, or orthonitrate is probably formed when oxide ion is placed into fused nitrates. It may well be that the dissociation reaction for pure nitrate should be written ... 

The other problem connected with this equilibrium is the fact that N02+ does not remain as such in the reaction mixture while one makes measurements it decomposes fairly rapidly. Hence, it was necessary to know the equilibrium constant for the pyrosulfate precisely and the rate at which it decomposed precisely in order to know, at any particular time after we add pyrosulfate to the fused nitrate, exactly how much N02+ was there. It turns out that one can electrochemically follow the rate of decomposition of N02+ potentiometrically since this equilibrium persists. As the N02+ disappears one can follow it and obtain much better data than we were able to get with chemical analyses. Therefore, the whole job of de-... 

Platinum is slightly attacked by fused alkali carbonate, more so by the fused nitrate or hydrogen sulphate, and strongly attacked by fused hydroxide or peroxide. 

Purple Fire. Take 1 part each of lampblack, red arsenic, and nitre 2 parts sulphur, 5 parts chlorate of potassa, and 16 parts fused nitrate of strontia. 

Studies have been reported" of the complex processes which are present when an attempt is made to react bromate and iodine in aqueous acidic solutions. The iodide reaction has also been examined in fused nitrate-salt mixtures. 

Baldwin s phosphorus. Fused nitrate of lime, which emits light for several hours after exposure to sunlight. 

At ordinary temperatures it is entirely unaffected by air or water, but at elevated temperatures it oxidizes readily. Molten sulfur and phosphorus attack the metal slowly, while the vapors of these elements react with it vigorously. The metal is not attacked by alkaline solutions, but fused nitrates, peroxides, alkaline carbonates, hydroxides, and acid sulfates attack it... 

F.R. Duke and S. Yamamoto, Acid-Base Reactions in Fused Salts. The Absolute Concentration of N02 Ion in Fused Nitrate, J. Am. Chem. Soc. 81 (1959) 6378-6379. 

J.M. Shlegel, The Decomposition of Chlorate in a Dichromate Solution in Fused Nitrates, J. Phys. Chem. 71 (1967) 1520-1521. 

Fused nitrate of strontla Melted strontium nitrate. 

Cryoscopic measurements in sodium nitrate indicate that this is an ionic melt. The extension of studies with organic solutes to this solvent or (Na, K)N03 eutectic (mp 233°) could give information about the solvated species, role of the solvent, and at higher temperatures the mechanism of oxidation. Based on inorganic reactions, currently there is disagreement about the existence in fused nitrates of oxide ion and nitronium ion. A fresh approach to the question with some organic reactions might help clarify the mechanism. 

Nickel and iron salts. Attacks by aqua regia, fused nitrates, cyanides, chlorides at >1000°C. Alloys with gold, silver, and other metals Fused samples contaminated with the metal rhodium to increase hardness. Platinum cmcibles for fusions and treatment with HF Ni and Fe crucibles used for peroxide fusions... 

When mixtures of anhydrous cobalt or manganous sulfate with alkali nitrates, nitrites, halogenates or perchlorates are heated, they turn brown or black because of the production of higher cobalt or manganese oxides. In these cases, the fused nitrates etc. function as oxygen donors to the solid sulfate ... 

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