Abstract
Foam height and foam stability of solutions of a linear alkylbenzene sulfonate (LAS) were measured according to the Ross‐Miles test to establish their relationship with ionic concentrations in the solution. The anionic concentration and water hardness were varied alternatively. The results obtained show different behavior for both parameters depending on the concentration of LAS and calcium. However, the results are in line with the proposed theoretical model based on the LAS‐calcium precipitation boundary diagram. These tests were aimed at providing a scientific explanation to the complex foaming phenomena. Also, these tests emphasize how essential it is to know the position of the points tested within the LAS‐calcium solubility diagram when evaluating the foam properties of an anionic surfactant.
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