So let's look at a few examples. Sulfuric acid, hydronium ion, phosphoric acid and carbonic acid are all examples of polyphonic acids. And that's because they all have more than two or more than one H plus ion that they can donate. This guy has three H plus ions that he can donate. So in the same way that we spoke about ionization reactions of monopolytic acids, we can also talk about ionization reactions of polyphotic acids. So let's look at a hypothetical example of a polyphotic acid, h two A.