8 Cr (s) + 30 HNO3 (aq) → 8 Cr(NO3)3 (aq) + 3 NH4NO3 (aq) + 9 H2O (l)
This is an oxidation-reduction (redox) reaction:
3 NV + 24 e- → 3 N-III (reduction)
8 Cr0 - 24 e- → 8 CrIII (oxidation)
HNO3 is an oxidizing agent, Cr is a reducing agent.
Reactants:
- Cr
- HNO3 – Nitric acid
- Other names: Aqua fortis , Spirit of niter , Eau forte
- Appearance: Colorless, yellow or red fuming liquid ; Colourless-to-yellow liquid with pungent odour ; Colorless, yellow, or red, fuming liquid with an acrid, suffocating odor. [Note: Often used in an aqueous solution. Fuming nitric acid is concentrated nitric acid that contains dissolved nitrogen dioxide.]
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