Complete the exercises below. Write complete balanced half-reactions for: a. oxidation of nitrous acid to nitrate ion in acidic solution, b. oxidation of N₂ to N₂O in acidic solution.

Half-reactions are the individual oxidation or reduction processes that occur in a redox reaction. They show the transfer of electrons and the changes in oxidation states of the reactants. In a balanced half-reaction, the number of electrons lost in oxidation must equal the number of electrons gained in reduction, ensuring charge and mass balance.

Oxidation states (or oxidation numbers) indicate the degree of oxidation of an atom in a compound. They help in identifying which species is oxidized and which is reduced in a reaction. Understanding how to assign oxidation states is crucial for writing balanced half-reactions, as it allows one to track electron transfer and changes in chemical species.

In an acidic solution, the presence of hydrogen ions (H⁺) influences the balance of half-reactions. Acidic conditions often require the addition of H⁺ ions and water molecules to balance the equation properly. Recognizing the role of H⁺ in the half-reaction process is essential for accurately representing the oxidation of species in acidic environments.