Note 78 — Chapter XI · THE HALOGENS: CHLORINE, BROMINE, IODINE, AND FLUORINE
George Kamensky translation
The specific gravities of their solutions as deduced by me on the basis of Topsöe and Berthelot's determinations for 15°/4° are as follows:—
10 20 30 40 50 60 p.c.
HBr 1·071 1·156 1·258 1·374 1·505 1·650
HI 1·075 1·164 1·267 1·399 1·567 1·769
Hydrobromic acid forms two hydrates, HBr,2H2O and HBr,H2O, which have been studied by Roozeboom with as much completeness as the hydrate of hydrochloric acid (Chapter X. Note 37).
With metallic silver, solutions of hydriodic acid give hydrogen with great ease, forming silver iodide. Mercury, lead, and other metals act in a similar manner.