Knowledge of chemical properties of acids, in particular, their interaction with oxides, will serve good service when performing the most various tasks in chemistry. It will allow to solve settlement problems, to carry out a chain of transformations, to perform tasks of practical character and also will help on testing including on the USE.

Sulfuric acid on physical properties – heavy oily liquid. It has no smell and color, is hygroscopic, is well dissolved in water. Less than 70% usually call solution with the maintenance of H2SO4 the diluted sulfuric acid, more than 70% – concentrated.

All complex substances in reactions show the different nature of behavior: either acid, or alkaline. However there are substances which behavior nature in various reactions under various conditions changes. Such substances are called amphoteric, i.e. in reactions they show both acid, and main properties.

It is possible to express a balance constant differently. Everything depends on statements of the problem. This size characterizes the shift of reversible chemical reaction towards formation of initial substances or certain products of this reaction.