Chemical And Physical Studies in the Metamorphism of Rocks: Based On a ...
Chemical And Physical Studies in the Metamorphism of Rocks: Based On a ...
A Irving
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Spring. The truth, in its more general range, may be illustrated by a very simple experiment. Mercuric chloride (HgOla) reacts upon potassic iodide (KI), as is well known. If 4 gms. of the former and 5 gms. of the latter be dried separately at 100°C in the form of coarse powder, and roughly mixed by shaking round in a dry flask, a certain pinkish hue, due to the formation of mercuric iodide [HgGl3 + 2KI = Hgl2 + 2KCl] is at once perceptible in the mixture. This deepens to a bright pink red when... further molar division of the mixture, effected by rubbing it in a mortar, increases the number of points of contact of the solid particles (so marked is the colour that it may be exhibited to a large class in a lecture). But even this is feeble as compared with the instantaneous production of the intense lovely hue of Hgia obtained by mixing together aqueous solutions of the two salts previously prepared separately in the ratio indicated above, which is an approximation to that of their 'equivalent proportions.' APPENDIX ii.
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