Calcium nitrate tetrahydrate is used in the preparation of calcium standard solutions.
정의
ChEBI: A hydrate that is the tetrahydrate form of cadmium nitrate.
Purification Methods
Crystallise the nitrate four times from water (0.4mL/g) by cooling in a CaCl2-ice freezing mixture. The tetrahydrate is dried over conc H2SO4 and stored over P2O5, to give the anhydrous salt. It is deliquescent. After 3 recrystallisations of ACS grade salt, it had Co, Fe, Mg, Sr and Zn at 0.2, 1. 0, 0.02, 10 and 0.02 ppm resp. [Bassett & Taylor J Chem Soc 105 1926 1914.]