What happens when acid is mixed with water?
It will increase the concentration of hydronium ions per unit volume.
The correct answer is option 1 i.e. It will increase the concentration of hydronium ions per unit volume.
When an acid is mixed with water, it dissociates or ionizes, releasing hydrogen ions (H+) into the solution. These highly reactive hydrogen ions immediately associate with water molecules (H2O) to form hydronium ions (H3O+).
Therefore, by adding an acid to water, you are directly increasing the number of hydronium ions (H3O+) present in a given volume of the solution, thus increasing the concentration of hydronium ions per unit volume. This increase in H3O+ concentration is what defines an acidic solution and lowers its pH value.
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