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Updated: May 20, 2025
The analyses of the liquid obtained by Wackenroder and others, by passing sulphureted hydrogen and sulphur dioxide through water, are based on the assumption that only one acid is present in the solution, and consequently do not establish the existence of pentathionic acid; as, for example, a mixture of one molecule of H2S4O6 and one molecule of H2S6O6 would give the same analytical results as H2S5O6.
Moreover, no salt of pentathionic acid has been prepared in a pure state. The author has succeeded in preparing barium pentathionate thus: A Wackenroder solution was about half neutralized with barium hydrate, filtered, and the clear solution evaporated in vacuo over sulphuric acid. After eighteen days crystals, which proved to be barium pentathionate + 3 molecules of water, formed.
The progress of the story is, however, extremely interesting; the whole spacious and varied scene of medieval life is there, and as Tieck and Wackenroder discovered Nuremberg, and Brentano the Rhine, so Arnim may be said to have shown in its full activity the Ghibelline city of Waiblingen.
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