This is a complexation reaction: Cu[NO3]2 is the formed complex.
This is an oxidation-reduction (redox) reaction:
Cu-2e-→CuII(oxidation)
2NV+2e-→2NIV(reduction)
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Cu is a reducing agent, HNO3 is an oxidizing agent.
Reactants:
Cu
Names: Copper, Copper (dusts and mists, as Cu), Cu
Appearance: Solid in various forms. turns green on exposure to moist air ; Reddish, lustrous, malleable, odorless solid.
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.]
Products:
Cu[NO3]2
NO2 – Nitrogen dioxide
Other names: Nitrogen(IV) oxide, Deutoxide of nitrogen, Nitrogen peroxide
Appearance: Brown gas ; Reddish-brown gas or brown or yellow liquid with pungent odour ; Yellowish-brown liquid or reddish-brown gas (above 70°F) with a pungent, acrid odor. [Note: In solid form (below 15°F) it is found structurally as N2O4.]
H2O – Water, oxidane
Other names: Water (H2O), Hydrogen hydroxide (HH or HOH), Hydrogen oxide
Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas
