We report precise data on the densities of the coexisting liquid phases near the liquid‐liquid critical point in D2O + deuterated isobutyric acid. The result for the critical exponent β (0.315 ± 0.008) is consistent with our earlier work on H2O + isobutyric acid, with other work on critical points in fluids, and with current theoretical predictions. The effect of deuteration is to increase the miscibility gap.
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Sandra C. Greer (1977) studied this question.