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尿素与无机盐形成络合物是很普遍的,到目前为止,对尿素及无机盐的水盐体系,已经做了很多工作。除钾盐与尿素不能形成络合物(但在熔盐体系中可形成KOAC.CO(NH_2)_2),及对铷、銫、金、铟、铊、铋及希土元素的盐尚无报导外,其它金属盐均能与尿素生成络合物。但尿素与复盐的水盐体系的研究还未见报导。莫尔盐是一个重要的复盐,分子式一般写为(NH_4)_2Fe(SO_4)_2·6H_2O,但也可写为(NH_4)_2[Fe(SO_4)_2]·6H_2O·25°C时莫尔盐的溶解度为1.05M,而硫酸亚铁的溶解度约为2M等对FeSO_4-CO(NH_2)_2-H_2O,体系的研究证明尿素与硫酸亚铁能形成络合物:FeSO_4·CO(NH_2)_2·4H_2O,FeSO_4·CO(NH_2)_2·2H_2O及FeSO_4·6CO(NH_2)_2·A·
Complex formation of urea with inorganic salts is common, and so far much work has been done on the water and salt systems for urea and inorganic salts. There is no report on the formation of complexes of potassium salt with urea (but KOAC.CO (NH_2) _2) in the molten salt system and salts of rubidium, cesium, gold, indium, thallium, bismuth and rare earth elements In addition, other metal salts can form complexes with urea. However, the study on the salt and water system of urea and double salt has not been reported yet. Mohr salt is an important double salt, the molecular formula is generally written as (NH_4) _2Fe (SO_4) _2 · 6H_2O, but also can be written as (NH_4) _2 [Fe (SO_4) _2] · 6H_2O · When Mohr The solubility of salt is 1.05M, and the solubility of ferrous sulfate is about 2M. The study on FeSO_4-CO (NH_2) _2-H_2O has shown that urea and ferrous sulfate can form complex: FeSO_4 · CO (NH_2) _2 · 4H_2O, FeSO_4 · CO (NH_2) _2 · 2H_2O and FeSO_4 · 6CO (NH_2) _2 · A ·