This question is about an interactive simulation where you can shake a salt shaker.
When you do that the grains of salt are represented by molecules with two colors: green and pink. Green color represents the larger ions, these are Na+ and the pink color represents the smaller ions, Cl-.
When the grains enter water they split and you see the Na+ and Cl- separate.
This represents the disolution of the table salt in water.
As you continue shaking the dissolution (separation of the grains once reached the water) becomes slower. Until a moment when no more grains dissolve. This is because the solution has become saturated.
