318 Experiments on a solid Compound 



formed by tlie action of the compound of iodine and chlorine, 

 saturated with c-hloiine on the same solution, and which I have 

 mentioned in a former paper, and which, consequently, must be 

 regarded as an oxyiode ot anmionia. 



W!ien an aqueous solution of the compound is poured into a 

 solution of the soluble salts of baryta and strontia, a copious 

 precipitate of their respective oxviodes is produced. The oxy- 

 iode of barium, as I have mentioned in my last communication 

 on iodine, is a compound very slightly soluble in water ; that of 

 strontium is rather more soluble ; and those of calcium, mag- 

 nesium, i^lucinum, ittrium, aluminum, zirconum, are more so, 

 and I believe in the order in wliich tlicv have been named. 



It forms combinations with all the metallic oxides I have tried 

 its agency upon, and precipitates lead and mercury from their 

 nitrous solutions. 



The action of the compound upon acids is much more singular 

 than that upon alkalies, earths, or metallic oxides. It appears 

 to form comiiinations with all the fluid or solid acids to which I 

 have been able to expose it, that it does not decompose. When 

 sulphuric acid is dropped into a concentrated solution of it in hot 

 water, a solid substance is precipitated, which consists of the 

 acid and the compound ; for, on evaporating tlie solution by a 

 t^entle heat, nothing rises l.nit water. On increasing the heat in 

 nn experiment of this kind, the solid substance formed, fused; 

 and on cooling the mixture, rhomboidal crvstals formed of a pale 

 vellow colour, which were very fusible, and which did not change 

 .It the heat at n'hich the compound of oxvgen and iodine decom- 

 poses, but sublimed unaltered. Mhen urged bv a much stronger 

 heat, it partially sublimed, and partially decomposed, aftbrding 

 oxvgen, iodine, and sul]-huric acid. 



With hvdro-phosphoric acid, the compound presents plia?no- 

 mena preciselv similar, and they form together a solid, yellow, 

 crystalline combination. 



it dissolves in solution of hydro-phosphorous acid ; but on 

 lieating the combination, iodine is immediately produced by a 

 decomposition of part of the compound, and the remaining part 

 unites to the phosphoric acid formed. 



When hydro-nitric acid is poured into a concentrated solution 

 of it, white crystals form in plates of a rhomboidal figure, and 

 which when dried partiallv decompose, and partially sublime at 

 a much lower heat than the sulphuric or phospiioric compounds, 

 and afford hydro-nitric acid, oxygen, and ioditie. 



It dissolves in solution of oxalic acid; but bv a very gentle 

 heat, the oxvgen of the compound acts on the inflammable l)ases 

 of the acids, and iodine and carbonic acid are disengaged in 

 great quantities. By 



