Elements of chemistry : including the applications of the science in the arts . formed by simply bringing the metals into contact with iodine,in water. All the iodides are decomposed by bromine, as well as by chlorine. The compounds of iodine may be shortly described in the following order:— Hydriodic acid HI Iodide of sulphur Iodic acid I03 Iodides of phosphorus Periodic acid I07 Chlorides of iodine Iodide of nitrogen ... NI3 | Bromides of iodine. COMPOUNDS OF IODINE. Hydriodic acid; or1592; HI. — Hydriodic acidcannot be prepared with ad-vantage by treating the iodideof sodium or potas
Elements of chemistry : including the applications of the science in the arts . formed by simply bringing the metals into contact with iodine,in water. All the iodides are decomposed by bromine, as well as by chlorine. The compounds of iodine may be shortly described in the following order:— Hydriodic acid HI Iodide of sulphur Iodic acid I03 Iodides of phosphorus Periodic acid I07 Chlorides of iodine Iodide of nitrogen ... NI3 | Bromides of iodine. COMPOUNDS OF IODINE. Hydriodic acid; or1592; HI. — Hydriodic acidcannot be prepared with ad-vantage by treating the iodideof sodium or potassium withhydrated sulphuric acid, as thelatter is partially convertedinto sulphurous acid by hy-driodic acid, with the separa-tion of iodine. It may beobtained in the state of gas,by forming an iodide of phos-phorus, 9 parts of dry iodineand 1 of phosphorus being in-troduced into a tube sealed atone end, to be used as a retort,and the mixture covered_ bypounded glass, and combina-tion determined by a gentleheat; and afterwards decom-posing this iodide of phos- Fig. 356 . IODINE. phorus by a few drops of water. Hydriodic acid instantly comes off as gas, andhydrated phosphorous acid remains in the tube: PI3 and 6HO=3HI and 3HO + P03. A slight heat may be applied to the tube, when the action abates, to expel the lastportions of hydriodic acid; but if the temperature be elevated, the residuary hy-drated phosphorous acid is decomposed, with evolution of phosphurctted hydrogengas, which may, therefore, be obtained by the same operation. This gas is verysoluble in water, and soon decomposed over mercury, which combines with its iodineand liberates hydrogen; so that it is collected in a dry bottle, B, by the method ofdisplacement, and the bottle is closed with a glass stopper when full of gas. Hy-driodic gas is colourless, of density 4443 by experiment and 4385 by theory, andconsists of 2 volumes of iodine vapour and 2 volumes of hydrogen gas united with-out condensation, or
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