What are the chemical equations and principles for the formation of heteropoly acids by the reaction of concentrated heat phosphoric acid and silica?
Silica and acid reaction junior high school: do not learn high school: hydrofluoric acid in practice: hot concentrated phosphoric acid, all kinds of fluorine acid can react with silica
Then, the whole reaction can be considered as SiO2 to grab the water inside phosphoric acid, turn itself into silicic acid, and then phosphoric acid to become partial phosphoric acid or PPA. Under the heating condition, the silica and phosphoric acid dehydrate together, and then the heteropoly acid can be formed
The principle of the reaction between concentrated phosphoric acid and silica is entropy reduction, which produces a volatile P2O5 or PPA (polyphosphate) relative to SiO2, and the reaction is carried out.
Heteropoly acids are mixtures that cannot be expressed in chemical formula
