On the manufacture of chlorine : a lecture, delivered, at the request of the Council of the Society of Arts, before the Chemical Section of that Society, May 22nd, 1874, A.W. Williamson ... in the chair / by Walter Weldon.

  • Walter Weldon
Date:
1874
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Licence: Public Domain Mark

Credit: On the manufacture of chlorine : a lecture, delivered, at the request of the Council of the Society of Arts, before the Chemical Section of that Society, May 22nd, 1874, A.W. Williamson ... in the chair / by Walter Weldon. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    happens, and that the MngOa into whicli MnO is slowly converted by long exposure to the air is really a compound of MnO with MnOg, exactly as manganous carbonate is a compound of ]\InO Vv'ith CO2, and manganous sulphite of MnO with SO2. There seems no doubt that hydrated Mn02, or HgMnOa, must be regarded as manganous acid, and that it reacts upon MnO in a manner exactly similar to that of the reaction upon MnO of cax'bonic and sulphurous acids. The reaction HaMnOa + MnO = HoO + MnMnO, can be effected just as readily as the reaction H2CO3 + MnO = H2O + MnCO^, or the reaction H2SO3 + MnO = H2O + JilnSOg; and you see that all three reactions are represented by precisely similar equations. And that the product of this reaction is really a salt, and not merely an oxide, is proved by its reacting with other salts according to the manner in which salts ordinarily react on each other, as in the examples— MnMnOa + CUSO4 = MnSO^ = CuMnOs, and MnMn03 + FeSOi = MnSOi + FeMnOs; and moreover by the fact that hydrated MnOj i-eacts on other protoxides in a precisely similar way, giving products which are unquestionably salts. It does this in especial with all the alkalies and alkaline earths, in accordance with the equations * which you see written on our diagram, the * HaMnOj + CaO = HjMnOj + SrO = HjMnOa + BaO = HjMnOa + Na^O = HjMnOj -f K2O = H2O + CaMnOa. H2O + SrMnOg. HjO + BaMnOj. HjO + Na^MnOj. H2O -f- KjMnO,.