Stabilization of an Aqueous Solution of a Liquid Micro Fertilizer Containing Trilon B as a Chelating Agent. Structure of the Molecular Crystal of Sodium Carbamide Ethylenediaminetetraacetate Hydrate NaH₃L¹·(H₂N)₂CO·H₂O

Chemical analysis methods were used to identify the causes for precipitation and fouling with a gray-green deposit of a vessel for the storage of liquid micro fertilizer consisting of ammonium heptamolybdate, potassium chloride, ammonium vanadate, boric acid, chromium trichloride, sodium selenate, and Trilon B as a chelating ligand. The precipitate represented the crystalline 1 : 1 complex of Trilon B with carbamide NaH₃L¹·(H₂N)₂CO·H₂O (H₄L¹ = ethylenediaminetetraacetic acid). The deposit on the vessel bottom and wall was formed upon transformation of the molybdenum complex Na₄(MoO₃)₂L¹·8H₂O into insoluble coordination polymer in an acid medium. Neutralization of the solution to pH 6–7 and a decrease in the concentration of Trilon B gave a violet micro fertilizer solution that was stable during storage. The molecular structure of the NaH₃L¹·(H₂N)₂CO·H₂O crystal was determined.