Anomalies in chemical equilibria near critical points of dilute solutions

We show that a recent prediction that the extent of reaction of a very dilute solute near the critical point of an almost pure solvent will show strong variation with temperature at fixed volume is in error. We give arguments to show that the behavior is at most weakly singular in the sense of Griffiths and Wheeler, point out the error in the earlier argument, and show that experiments adduced as evidence for the earlier argument are subject to alternative explanation. We also consider a prediction about the behavior near the critical point of a dissociating solvent.