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By Sartori M

This e-book via my student, which I current to the Italian public, is a whole account of the data and evidence acquired with scrupulous diligence from very quite a few resources, defined with readability and clinical precision, in order that it constitutes a reliable and useful paintings of reference for chemists and of knowledge for college kids of this topic.

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Sample text

Chlorine reacts similarly with a large number of metallic oxides, forming the metal chloride and evolving oxygen. In presence of water and of soluble metallic oxides, oxygen is not formed, but unites with the chlorine to form salts of the oxygenated acids of chlorine (hypochlorites or chlorates). If chlorine is bubbled through a cold, dilute solution of an alkali hydroxide, chloride and hypochlorite are formed, as, for example, with sodium hydroxide : C12 + 2NaOH = NaCIO + NaCl + H2O. " This compound is somewhat unstable and has an oxidising and chlorinating action.

With damp oxygen it reacts to form hydrobromic acid, oxalic acid and a bromine-compound which has strongly irritating properties (Lemoult). It reacts with bromine to form tetrabromoethylene, colourless crystals melting at 55° to 56° C. p. 95° to 96° C. At ordinary temperatures, hydriodic acid adds on to the molecule forming dibromoiodoethylene, Br2C = CHI, a liquid boiling at 91° C. at 15 mm. pressure. Density, 2-952 at 24° C. (Lawrie). Dibromoacetylene is a substance of highly toxic properties.

M. ). Confirmation of the presence of chlorine by chemical methods may be carried out by one of the following reactions : Flame Method. Detection of chlorine by this method is based on the reaction noticed by Beilstein,2 according to which chlorine burnt at the base of a spiral of copper wire suspended in the flame of a spirit lamp produces volatile copper chloride which colours the flame a bright green. The apparatus usually employed for this test consists of an ordinary spirit lamp or gas burner carrying in the flame a small copper spiral.

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