According to the Iranian acid based concept in Aqueous Solutions, the hydronium ions are responsible for acidic properties and the oh ions are responsible for the basic properties. Now, one problem with such a definition exists molecules such as ammonia, molecules that produce basic solutions and react with acids and yet they have no oh ions. So if we look at the structure of NH three Ammonium, we see that it contains three HS, one N and a pair of electrons. Clearly, it has no oh ions. So according to our Iranians Acid Based definition, this cannot be a base, yet it has basic properties. So this definition isn't that good.