In a neutralisation reaction, what is formed per mole under standard conditions?

• A. Water
• B. Salt
• C. Hydrogen gas
• D. Oxygen gas

Answer: (A)

Neutralisation is the reaction of H+ from the acid with OH- from the base to form water. For every mole of H+ that reacts with OH-, one mole of water is produced. Under standard conditions, the product formed per mole of neutralisation is water. The reaction can also form a salt from the remaining ions, but the species generated directly by the neutralisation step is water. Hydrogen and oxygen gases are not produced in this process.