Write the formula of the ions whose concentration changes while diluting acid and a base.
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When the solution of an acid is diluted then its strength decreases as there is decrease in the concentration of hydronium (H
3
O
+
)ions. Diluting with water of an acid causes lowering of concentration of hydronium ion because of adding H
2
O but there are no excess H
+
to make it (H
3
O
+
). It means number of (H
3
O
+
) remains same but the total volume of the solution has increased thus causing the fall in concentration of hydronium ions as concentration is quantity/volume.
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