English: Dipotassium sodium hexanitrocobaltate(III) monohydrate (K2Na[Co(NO2)6]·H2O) possibly mixed with lesser amounts of other potassium-sodium salts - e.g. KNa2[Co(NO2)6]·H2O.
Obtained from a test for potassium: a reaction between sodium cobaltinitrite and potassium ions. Precipitate separated by centrifugation.
Source for claims:
AG Vendilo, NE Kovaleva, VI Chistov, VM Retivov. (2011). "Potassium cobaltinitrite". Russian Journal of Inorganic Chemistry. 56 (4): 501–505. doi:10.1134/S0036023611040267.
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