Question: What does a minimum in surface tension as a function of concentration of surfactant indicate Presence of glycerol like water soluble impurity Presence of inorganic

What does a minimum in surface tension as a function of concentration of surfactant indicate Presence of glycerol like water soluble impurity Presence of inorganic salt such as NaCl as an impurity Presence of an impurity that is less surface active than the surfactant Presence of an impurity that is more surface active than the surfactant

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