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Parastannic Acid

It was found by Berzelius that when β-stannic acid is heated with water at 100° C. it passes into another form of stannic acid, which when air-dried has the empirical composition 5SnO2.8H2O, and is probably H2Sn5O11.7H2O. This compound when dried in a vacuum becomes 5SnO2.3H2O or H2Sn5O11.2H2O, rather than SnO2.H2O or H2Sn5O11.4H2O, which is β-stannic acid. The potassium salt of parastannic acid is K2Sn5O11.2 or 3H2O, to which parastannyl chloride, shortly to be described, corresponds.

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