pentathionate

After eighteen days crystals, which proved to be barium pentathionate + 3 molecules of water, formed.

Scientific American Supplement, No. 275, April 9, 1881 Various

These on analysis proved to consist of baric pentathionate with three molecules of water.

Scientific American Supplement, No. 275, April 9, 1881 Various

These crystals were separated, and the liquid further evaporated, when a second crop was obtained intermediate in composition between the tetra and pentathionate.

Scientific American Supplement, No. 275, April 9, 1881 Various

It seemed as if the sulphur when eliminated from the pentathionate combined with the tetrathionate.

Scientific American Supplement, No. 275, April 9, 1881 Various

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.

Scientific American Supplement, No. 275, April 9, 1881 Various

Dr. Dupré asked Dr. Debus how it was that a molecule of pentathionate could be re-crystallized, whereas two molecules of pentathionate, which should, when half decomposed, furnish a molecule of tetra and a molecule of pentathionate, could not.

Scientific American Supplement, No. 275, April 9, 1881 Various

If potassium tetrathionate was dissolved in water it could be re-crystallized, but potassium pentathionate under similar circumstances splits into sulphur and tetrathionate; but a mixture of tetrathionate and pentathionate can be re-crystallized.

Scientific American Supplement, No. 275, April 9, 1881 Various

By a similar method of procedure the author obtained potassium pentathionate, anhydrous, and with one or two molecules of water.

Scientific American Supplement, No. 275, April 9, 1881 Various