Amphoteric oxides were found some years ago. In many reactions, it has been observed that amphoteric oxides resemble both acidic as well as basic properties. Some scientists have classified Amphoteric oxides undergoes the phenomenon of amphoterism.
Amphoteric OxidesAs said earlier amphoteric oxides show the ability and properties of both acids and bases. Amphoteric oxides are also said to be amphoteric molecules of metals, which can donate as well take protons in solutions. Many metals form Amphoteric oxides like Zinc (Zn), Tin (Sn), Lead (Pb), Aluminum (Al), Beryllium (Be). Even many metalloids also form amphoteric oxide as well as hydroxides.
Amphoteric oxides, which is also referred in its another form of Amphoteric molecules includes Amino acids, proteins. These compounds have amine group and carboxylic groups attached to them.Properties of Amphoteric OxidesSome important properties showing by Amphoteric oxides are as follows:A per the Lowry theory of acids and bases, he explained the fact that an acid is a proton donor and a base is a proton acceptor , and these both qualities are possessed by Amphoteric oxides.
Some common Amphoteric compounds like water, hydrogen carbonate, hydrogen sulphate, amino acids are said to be the good examples of Amphoteric species.Amphoteric oxides posses both properties of acids and bases that why they are said to donate as well as gain protons also just like acids and base do.A perfect example of an Amphoteric oxide acting as a base is HCO3-HCO3- + H2O a `->` H2CO3 + OH-An Amphoteric oxide acting as an acidHCO3- + H2O a `->` CO32- + H3O+Most commonly used example for Amphoteric oxide is WaterExamples of Amphoteric oxides also includes Zinc Oxide (ZnO),
Aluminum Hydroxide [Al(OH)3] , Beryllium Hydroxide [Be(OH)2], Lead Oxide (PbO).Some other elements which also forms Amphoteric oxides are Silver (Ag), Cobalt (Co), vanadium (V), Silicon (Si), Germanium (Ge), etc.ConclusionThe most common property of Amphoteric oxides are that they can be either acids or bases. On being reacted with acids and bases Amphoteric oxide forms corresponding salts. It has been also said that all Amphoteric substances contain Hydrogen.