What happens when an acid or a base is mixed with water?

A

Decrease in the concentration of ions (H2O+/OH-) per unit volume

B

Decrease in the concentration of ions (H3O+/OH-) per litre volume

C

increase in the concentration of ions (H3O+/OH-) per unit volume

D

Decrease in the concentration of ions (H3O+/OH-) per unit volume