where 𝑎, 𝑏, 𝑐, and 𝑑 now represent the empirical parameters unique to each reaction-solvent pair. Eq 11 ensures that ΔΔ𝐺 ‡ solv approaches a correct limit of zero as temperature approaches a critical point. More details on the critical limit can be found in the dedicated work of Japas and Levelt Sengers and in our prior study .