K3[Co(NO2)6] + 2KOH → Co(OH)2 + 4KNO2 + KNO3 + NO
Potassium hexanitrocobaltate(III) react with potassium hydroxide to produce cobalt(II) hydroxide, potassium nitrite, potassium nitrate and nitric oxide. Potassium hydroxide - concentrated solution. The reaction takes place in a boiling solution.