When an ionic solid is placed in water, the water molecules separate the ions from the crystal surface to the solution, surrounded by water molecules. The ion concentration in the solution increases and some ions redeposited on the crystal surface. A balance between these two processes is stablished and the ion concentration in solution reaches a constant value. In this moment the same number of ions pass from the solid to the solution than vice versa. The solution is saturated. Can you suggest an experiment to confirm the existence of this dynamic process in a reversible solution? Work with other students and talk to your teacher.