However, pure water is neutral because of the different properties with its own (Auto-dissociation), in water is atmospheric equilibrium between the concentrations of (H3O +)and (OH −), which is the same value. Therefore, Water solubility of the substance is acid, according to the new guard of ARI niat, therefore the concentration of hydrogen ion added. Again, because the hydrogen ion (H +) is an ion that has only one elementary particle is a Proton. Therefore, popular chemist called Proton. If the water solubility is in the Proton may be written instead as (H3O +) is caused by a combination of a Proton to a molecule of water.