The change in the absorption spectrum of cobalt chloride in aqueous hydrochloric acid solution with change of temperature

Abstract
The change in the absorption spectrum of cobalt chloride in aqueous solution with increasing concentration of hydrochloric acid at constant temperature (20° C) has already been investigated.* It was shown that with increasing concentration of acid up to 5N HCl, no blue constituent was formed. The cobalt atom, therefore, retains its six grouping over this range. The effect of increasing acid concentration is to replace two molecules of water by two atoms of chlorine: [Co(H 2 O) 6 ] → [Co(H 2 O) 4 Cl 2 ].
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