[Co(NH3)6]Cl3 + 3HNO3 → [Co(NH3)6](NO3)3 + 3HCl
Hexaamminecobalt(III) chloride react with nitric acid to produce nitrate hexaamminecobalt(III) and hydrogen chloride. Hexaamminecobalt(III) chloride - saturated solution. Nitric acid - diluted solution.