One variety of calcium ammonium nitrate is made by adding powdered limestone to ammonium nitrate; another, fully water-soluble version, is a mixture of calcium nitrate and ammonium nitrate, which crystallizes as a hydrated double salt : 5Ca ( NO 3 ) 2 " NH 4 NO 3 " 10H 2 O . Unlike ammonium nitrate, these calcium containing formulations are not classified as oxidizers by the United States Department of Transportation.
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For example, KCeF 4 is a double salt and gives K +, Ce 3 + and F & minus; ions when dissolved in water, whereas K 4 [ YbI 6 ] is a complex salt and contains the discrete [ YbI 6 ] 4 & minus; ion which remains intact in aqueous solutions . according to an Ida Freund publication from 1904 reprinted in 2014, the former involves a chemical combination with fixed composition, whereas the latter is a mixture.
