Hydrochloric, nitric, and other acids form solutions having definite boiling points, like that of hydriodic acid.
The solution will then represent, like a solution of hydriodic acid in water, a liquid which is not altered by distillation, while the pressure under which this distillation takes place remains constant.
Hydriodic acid, HI, is formed by the direct union of its components in the presence of a catalytic agent; for this purpose platinum black is used, and the hydrogen and iodine vapour are passed over the heated substance.
On shaking up iodine with a solution of sulphuretted hydrogen in water, a solution of hydriodic acid is obtained, sulphur being at the same time precipitated.
I consider the law as established also with regard to hydriodic acid by the experiments and considerations already advanced in the preceding division of this series of Researches (767.
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