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Urea ( CO(NH2)2 ) is a white, water soluble organic compound that is used to remove excess nitric acid in solution. The effectiveness of urea has been discussed quite often and most people recommends sulfamic acid or evaporation when denoxing.
CO(NH2)2(aq) + HNO3(aq) => (NH2)2COHNO3(s)
Urea nitrate is an explosive chemical and should not be stored in larger amounts. When treating filter papers with urea nitrate a vigorous reaction can happen.