"Mixing an acid or base with water results in decrease in the concentration of ions(H3O/OH-) per unit volume"

Acid when mixed with water gives out H+ ions which because they cannot exist alone form H3O ions. Then how does the concentration 'decrease' ?

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Solution

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. This is because on dilution the overall volume of solution increases and so the number of hydronium ions per unit volume decreases.

the concentration of hyrodium ions per formula unit becomes less when an acid is diluted

A given solution of an acid is diluted by adding more water. Thus, the overall volume of the solution increases. However, the number of hydrogen ions in solution remain the same. Therefore, the number of hydrogen ions per unit volume decreases and hence the concentration of hydrogen ions decreases.

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