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This lecture covers the concept of chemical equilibria, focusing on the equilibrium between slightly soluble ionic compounds and their ions in solution, as well as simultaneous equilibria. It discusses the effect of common ions on solubility, electroneutrality conditions, and the calculation of ion concentrations in saturated solutions. Additionally, it explores the enthalpy of dissolution, solvation processes, and the relationship between solubility, entropy, and temperature. The lecture provides examples and equations to illustrate these concepts.