H2SnO4

H2SnO4 is the chemical formula for stannic acid, also known as tetrahydroxystannic acid or orthostannic acid. It is an inorganic compound that is a weak acid. Stannic acid is not typically found in its pure, isolated form and is generally encountered as a hydrated oxide, often referred to as tin(IV) oxide hydrate. The exact structure and composition of these hydrated forms can vary. It is formed when tin(IV) compounds, such as tin(IV) chloride, are hydrolyzed in water. When heated, stannic acid dehydrates to form tin(IV) oxide (SnO2). Stannic acid is an amphoteric substance, meaning it can react with both acids and bases. It will react with strong bases to form stannate salts, which contain the stannate anion, [Sn(OH)6]2-. In the context of chemistry, stannic acid is important as an intermediate in the preparation of other tin compounds and in various chemical processes involving tin. Its properties are characteristic of the hydrated oxides of group 14 elements.