The osmotic pressure of a solution is proportional to the molar concentration of the solute particles in solution.
If increase solute concentration, then osmotic pressure increases. If decrease the solute concentration, then osmotic pressure decreases. Osmotic pressure is directly related to the concentration of the solutes. Osmotic pressure is a 'colligative' property, which means that it depends on the number of particles in solution but not on their chemical identity.
Osmotic pressure is closely related to some other properties of solutions. These include the freezing point depression, the boiling point elevation, and the vapor pressure depression, all caused by dissolving solutes in a solution.
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