Thorium nitrate tetrahydrate

THORIUM NITRATE TETRAHYDRATE (13823-29-5) Noncombustible but will intensify an existing fire. Reacts with water, forming a weak nitric acid solution. A strong oxidizer reacts violently with reducing agents, combustible materials, organic substances, finely divided metals. Aqueous solution reacts with alkalis. Attacks metals in the presence of moisture. 

Ferraro, J. R., Katzin, L. I., Gibson, G., Reaction of thorium nitrate tetrahydrate with nitrogen oxides. Anhydrous thorium nitrate, J. Am. Chem. Soc., 11, (1955), 327-329. Cited on pages 314,451. 

Thorium nitrate solution, dissolve 15.0 g of analytical reagent grade thorium nitrate tetrahydrate in water and dilute the solution to 1000 ml. 

Thorium Nitrate, Thorium Fluoride Thorium Thorium Dioxide Tetrahydrate Tetrahydrate Carbonate... 

Thorium nitrate is very soluble in water, to the extent of 65.6 g Th(NO3)4/100 g solution at 20°C. It can be crystallized from solution as the nominal tetrahydrate. Thorium nitrate solutions are used for purifying thorium by solvent extraction. Sec. 9. ... 

Pure anhydrous thorium nitrate is difficult to prepare. It is obtained by thermal decomposition of an adduct resulting from the interaction of the tetrahydrate with dinitrogen pentoxide in anhydrous nitric acid [1955FER/KAT]. Other preparative routes involving dinitrogen tetroxide have also been explored [1965SCH/KOE], [1984KUM/TUC]. 

Charpin, P., Chevrier, G., Lance, M., Nierlich, M., Vigner, D., Livet, J., Musikas, C., Stracture of thorium(IV) nitrate tetrahydrate, Acta Crystallogr., Sect. C Cryst. Struct. Commun., CAS, (1987), 1239-1241. Cited on page 315. 

Hexanitrato Complexes. Alkali metal and ammonium hexanitrato complexes, M2Th(N03)e (M = Rb, Cs, NH4), crystallise from nitric acid solutions containing the appropriate cation and thorium nitrate [1,3 to 7,13]. The caesium salt is also obtained when (N02)2Th(N03)e is reacted with CSNO3. The nitronium complex, (N02)2Th(N03)e, is conveniently obtained by addition of chlorine nitrate to thorium tetrachloride [8] or by the addition of dinitrogen pentoxide to thorium tetranitrate tetrahydrate in anhydrous nitric acid [23]. Treatment with dinitrogen tetroxide results in the formation of (N0)2Th(N03)e [8]. 

As can be seen, the nitrate complexes are, in the main, the dominant thorium species in solution. As there are no experimental values for the enthalpy of formation of these complexes (for either thorium or uranium), only the difference between the enthalpies of solution of the pentahydrate and the tetrahydrate has been used (see Section X. 1.3.2) in conjunction with other results, to evaluate (Th(N03)4-4H20, cr, 298.15 K). 

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