What is the difference between solubility equilibrium and dynamic equilibrium?

Answer 1

Solubility equilibria are a subset of dynamic equilibria.

Of course, the concentration of the insoluble solid is a meaningless concept and does not appear in the solubility equilibrium; given an "insoluble" solid in water, the rate of solute dissolution is equal to the rate of solid deposition. The dissolution of a sparingly soluble salt is unquestionably an equilibrium reaction.

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Answer 2

Henry Antrim

Solubility equilibrium refers to the balance between the dissolved and undissolved states of a solute in a solvent, while dynamic equilibrium occurs when the rates of the forward and reverse reactions in a chemical system are equal, resulting in no net change in the concentrations of reactants and products over time.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.