Urea nitrate is quite easily prepared by reacting nitric acid with an equimolar portion of urea.  The strength of the acid does not matter as long as there is enough of it; usually dilute acid is used.  The acid is added, with stirring, to a highly concentrated solution of urea dissolved in the minimum volume of hot water.  The reaction will generate a good deal of heat, so the acid addition should be rather slow, or the reaction beaker can be cooled in an ice bath.  A slight excess of nitric acid is recommended.  The resulting solution is cooled in the freezer to precipitate the urea nitrate.  Filter to collect the crystals and dry them at a low heat in an oven.  Urea nitrate tends to decompose if it is stored moist.

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