8 HNO3 + 6 HI + K2Cr2O7 → 2 Cr(NO3)3 + 3 I2 + 2 KNO3 + 7 H2O
This is an oxidation-reduction (redox) reaction:
6 I-I - 6 e- → 6 I0 (oxidation)
2 CrVI + 6 e- → 2 CrIII (reduction)
HI is a reducing agent, K2Cr2O7 is an oxidizing agent.
Reactants:
- 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.]
- HI – Iodane
- K2Cr2O7 – Potassium dichromate(VI)
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