. Introduction to inorganic chemistry . sedthrough a U-tube contaiiningglass beads mixed with redphosphorus. The latter com-bines with any brominewhich may have escapedchemical change and havebeen carried along with thegas. The second U-tube,containing water, may beattached when a solution ofthe gas is required. I. ^*- ™- Physical Properties. — Hydrogen bromide is acolorless gas with a sharp odor. It is two and a half times as heavy asair. It is easily reduced to the liquid condition. It is exceedingly sol-uble in water, and in contact with moist air condenses the water vaporto clouds of liqui
. Introduction to inorganic chemistry . sedthrough a U-tube contaiiningglass beads mixed with redphosphorus. The latter com-bines with any brominewhich may have escapedchemical change and havebeen carried along with thegas. The second U-tube,containing water, may beattached when a solution ofthe gas is required. I. ^*- ™- Physical Properties. — Hydrogen bromide is acolorless gas with a sharp odor. It is two and a half times as heavy asair. It is easily reduced to the liquid condition. It is exceedingly sol-uble in water, and in contact with moist air condenses the water vaporto clouds of liquid particles. When distilled, the solution in waterbehaves like that of hydrogen chloride (p. 182). It loses mainly eitherwater or hydrogen bromide, according as it is dilute or exceedinglyconcentrated, until an acid of constant boiling-point (126^ at 760 ), containing 48 per cent of hydrogen bromide, passes over. Hydrogen bromide, whether in the gaseous condition or in theliquefied form, is a nonconductor of Chemical Properties. — The chemical properties of hydrogenbromide are similar to those of hydrogen chloride (p. 183). It is some-what less stable, and dissociation into its constituents begins to benoticeable at 800° When free from water, it is not an acid (seebelow), and is not very active chemically, although it behaves towardssome metals much like hydrogen chloride. When the solution inwater is strongly cooled, crystals of a definite hydrate (HBr, 2HjO),corresponding to that of hydrogen chloride, are obtained. When thegas is mixed with chlorine, hydrogen chloride and free bromine areinstantly produced, and much heat is evolved by the change, 2HBr-|- THE HALOGEN FAMILY 233 Clj —»2HC1 + Bij. The heat produced by the union of hydrogen andbromine vapor is 12,100 calories. This is much less than the amountproduced by the union of chemically equivalent quantities of hydro-gen and chlorine (22,000 calories). When chlorine displaces brominefrom
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