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Zinc Nitrate, Zn(NO3)2

The anhydrous salt may be prepared by dehydrating the hydrated salt at 130°-135° C. in an atmosphere of nitrogen pentoxide. The pasty mass crystallises on cooling and dissolves in water with great evolution of heat. According to Pierre, the hexahydrate loses all its water at 105° C. in a current of dry air.

From solutions of zinc nitrate obtained by ordinary methods, the hexahydrate, Zn(NO3)2.6H2O, crystallises at ordinary temperatures in transparent four-sided prisms. It is deliquescent, has a density of 2.063 at 13° C. and 2.067 at 15° C., melts at 36.4° C., and is very soluble both in water and alcohol.

Its solubility varies from 44.63 parts of Zn(NO3)2 in every 100 parts of solution at -18° C. to 63.63 parts at +36° C.

It loses half of its water at 100° C., but prolonged heating results in the formation of basic salts, and if the heating is conducted in vacuo a mixture of zinc oxide and the trihydrate appears to remain. It boils at 131° C., and remains clear till it loses 42 per cent, of its weight. The glassy mass then cools to crystalline 3Zn(NO3)2.ZnO.3H2O. At higher temperatures it is completely converted into zinc oxide.

On prolonged desiccation over sulphuric acid it loses half of its water and some nitric acid, a basic salt being left. Its heat of solution is -5.840 Cal.

Between 34° C. and 36.4° C. it is transformed into the trihydrate, which crystallises in small needles when the hexahydrate is kept molten for some time at 37°-40° C., or when a solution of zinc nitrate, containing a little sulphuric acid, is concentrated on the water-bath and allowed to stand over sulphuric acid. The needles melt at 45.5° C. and quickly become the hexahydrate in the air. The solubility of the trihydrate varies from 66.38 parts of anhydrous salt in every 100 parts of solution at 37° C. to 77.77 parts at 45.5° C.

Zinc nitrate crystallises from its solutions at temperatures below about -17.5° C. as the nonahydrate. This is most easily obtained by cautiously melting the cryohydrate formed at - 29° C. Its solubility Varies from 40.12 parts of anhydrous salt in 100 parts of solution at -25° C. to 43.59 parts at -18° C.

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