Profiles for ion activities are multiphasic, not curvilinear

TL;DR

This paper demonstrates that ion activity profiles in simple inorganic compounds are best described as multiphasic, consisting of straight-line segments with abrupt transitions, challenging the traditional curvilinear models.

Contribution

It provides empirical evidence that ion activity profiles are multiphasic rather than curvilinear, supporting a revised understanding of ion activity behavior.

Findings

Ion activities are best modeled as multiphasic profiles.

Profiles consist of straight-line segments with discontinuous transitions.

Supports previous findings with new data.

Abstract

In agreement with previous findings (Nissen 2017a,b), data (Wilczek-Vera et al. 2004) for the ion activities of a variety of simple inorganic compounds are shown to be precisely represented as multiphasic, i.e. as a series of straight lines separated by discontinuous transitions.