Stannic acid

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Stannic acid refers to hydrated tin dioxide, SnO₂. The character of this is debatable. Also called stannic hydroxide, it can be given formula Sn(OH)₄. In line with the almost contradictory names, stannic acid is amphoteric: Stannic acid dissolves in base to form stannate ion, Sn(OH)₆^2-. This can then form stannate compounds and, in strongly acid conditions, it forms tin(IV) ion, Sn⁴⁺.

Stannic acid, however, is a poor oxidizer. Combined with a good reducing agent, it can form stannous hydroxide, Sn(OH)₂, but, depending upon pH and the reducing agent, often forms tin metal.

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