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# How is the concentration of hydronium ions $$H_3 O^+$$ affected when a solution of an acid is diluted?

The concentration of hydronium ions $$H_3 O^+$$ decreases when an acid is diluted because, on adding water the $$H^+$$ ions of the acid and hydroxyl ions of water react to form water molecules and this in-turn decreases Hydronium concentration in the solution.