Abstract
AbstractThe pink color of an aqueous solution of cobalt(II) chloride changes into reddish violet with the addition of a large amount of sodium perchlorate, and the resulting solution exhibits a remarkable thermochromism, becoming bluish even by slight heating. Spectral data on these color changes are given and discussed from the point of view that the decrease of water activity caused by the added inert salt favors the formation of chlorocomplexes. A similar effect of sodium perchlorate was also observed in aqueous solutions of copper(II) and nickel chlorides.
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