Hydroxylammonium oxalate

NH30H]2C204 Hydroxylammonium oxalate, 3 83 [NIIjOHJsAsOa Hydroxylammonium arsenate, 3 83 [NH30H]3P04 Hydroxylammonium phosphate, 3 82 NH4N3 Ammonium azide, 2 136, 137... 

NH30H]2C204 Hydroxylammonium oxalate, 3 83 [NH30H]8As04 Hydroxylammonium arsenate, 3 83... 

Davidson, C. M., Hursthouse, A. S., Tognarelli, D. M., Ure, A. M., and Urquhart, G. J. (2004). Should acid ammonium oxalate replace hydroxylammonium chloride in step 2 of the revised BCR sequential extraction protocol for soil and sediment Anal. Chim. Acta 508, 193—199. 

Can also be obtained from the stoichiometric quantities of hydroxylammonium chloride, oxalic acid and sodium hydroxide (sufficient for neutralization). A diluted solution of the hydroxylammonium salt (140 g. in 400 ml. of water) is used. All the solid oxalic acid is added at once with vigorous mechanical agitation, and the mixture is neutralized with a solution of 80 g. of NaOH in 200 ml. of HgO. This solution is added in the fastest possible stream of separate drops. The mixture is agitated for 30 minutes, cooled to 15 C, filtered and washed three times with 100 ml. of HgO. Since the salt at this point often contains up to 10% of oxalic acid, it must be recrystallized from eight times its weight of water. The yield is 95 g. the purity is 99%. Formula weight 156.10. 

The normal hydroxylammonium salts of phosphoric, arsenic, and oxalic acids are colorless crystalline com-poimds. They are insoluble in organic solvents, and only sparingly soluble in water at room temperature. Some solubility values from the literature are given below. The solubility of the arsenate and the decomposition points of the three salts were determined on the recrystallized mate-... 

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