Question

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Answer 1

Answer:

The concentration of hydronium ions 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 the concentration of hydronium ions decreases. When an acid is diluted, then the concentration of hydronium ions decreases.

Answer 2

Answer:

In the presence of water acid give H+ ion .as H+ ion cannot exist alone ,so it combines with water molecules and forms H3O+ ion. when an acid is diluted H+ ions of acid and OH- ions of water react to from H2O molecules and hence the concentration of H3O+ ion decrease