Add the redox reaction, arrange the coefficients using the electronic balance method: Cu + HNO3

The reaction takes place between substances such as copper and dilute nitric acid. As a result of this interaction, a copper nitrate salt, bivalent nitric oxide is formed and water is released. The molecular equation of the reaction can be written as follows:

3 Cu + 8 HNO3 = 3 Cu (NO3) 2 + 2 NO + 4 H2O.

The ionic reaction equation can be written as follows:

3 Cu ° + 4 H⁺ + N⁺⁵O₃⁻² = Cu⁺² + (N⁺O₃⁻²) ₂ + 2 N⁺⁴ + 2O⁻² + 2 H⁺ + O⁻²
We compose the equation of electronic balance.

N⁺⁵ + 1e = N⁺⁴ 2 oxidizing agent, therefore it is reduced
Cu ° – 2e = Cu⁺² 1 reducing agent, therefore oxidizes.