During the past quarter of a century many investigations have been made to determine the constitution and equilibria of chromates in aqueous solution. The preponderance of evidence previously and now contributed strengthens the conclusion that the most important equilibrium may be expressed by the equation : As will be shown in the following experiments, the colors' of chromic acid, dichromates and chromates in solutions more dilute than 0.0037~ are identical, that is, at these concentrations,

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... oth the chromic acid and the dichromates are completely2 hydrolyzed, in accordance with the above equation. Furthermore, it will be shown that heat3 promotes the reversal of such reactions, therefore, since the effect of hydroxyl and hydrogen ions has long been known, we have the following simple view of chromate solutions : Concentration Heat Acids Cf. data on pages following.