from the GNU version of the Collaborative International Dictionary of English
- adj. Pertaining to, or designating, an acid of sulphur obtained by leading hydrogen sulphide into a solution of sulphur dioxide; -- so called because it contains five atoms of sulphur.
from The Century Dictionary and Cyclopedia
- Noting a rather unstable, colorless acid obtained in solution by the interaction of sulphureted hydrogen and sulphurous acid. Its composition is H2S5O6.
Sorry, no etymologies found.
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 H_2S_4O_6 and one molecule of H_2S_6O_6 would give the same analytical results as H_2S_5O_6.
The president said that the society had to thank the author for a very complete research on the subject of pentathionic acid.
Dr. Debus said that no one had previously been able to make the salts of pentathionic acid, and expressed his sense of the great merit due to the author for his perseverance and success.
Messrs. Takamatsu and Smith; in his opinion these authors had proved the existence of pentathionic acid.
In March last the author, at the suggestion of Dr. Debus, undertook an investigation of pentathionic acid, the existence of which has been denied.
Moreover, no salt of pentathionic acid has been prepared in a pure state.