Classify if H^3PO^4 is a strong or weak acid, or strong or weak base, or salt?
H3PO4 is commonly known as Phosphoric acid. As the name suggests, this compound is an acid. Generally an acid, is a proton donor, has a pH below 7, neutralizes base and turns blue litmus paper to red. This also means that in a solution (in water) H3PO4 produces Hydronium ions (H3O+ ions).
The chemical equation for the dissociation of Phosphoric acid (H3PO4) in the solution can be written as:
H3PO4(s) + H2O(l) --->H3O+(aq) + H2PO4−(aq)
H2PO4−(aq)+ H2O(l) <--->H3O+(aq) + HPO42−(aq)
HPO42−(aq)+ H2O(l) <---> H3O+(aq) + PO43−(aq)
**H3PO4 contains 3 H's that can be protonated.
The first ionization (protonation) of Phosphoric acid can only be considered as strong acid.