Physical Chemistry's birth was fraught with controversy, a controversy about electrolyte solution chemistry which has much to say about how scientific knowledge originates, matures, and responds to challenges. This has direct implications for the way our students are educated in physical chemistry in particular and science in general. The incursion of physical measurement and mathematics into a discipline which had been largely defined within a laboratory of smells, bangs, and colours was equivalent to the admission into chemistry of the worship of false gods according to one chemist. The controversy can be classified as a battle between "dissociationists" on the one hand and "associationists" on the other; between the "Europeans" on the one hand and the "British" on the other; between the "ionists" on the one hand and the "hydrationists" on the other. Such strong contrasts set the ideal atmosphere for the development of argumentation skills. The fact that a compromise position, first elaborated in the late 19th century, has recently enhanced the explanatory capacity for electrolyte solution chemistry is challenging but one in which students can participate to their benefit.