In this lesson our instructor talks about solutions and their behavior. First, he talks about units of concentration, like dissolves like, and factors affecting solubility. Then he talks about colligative properties. He ends the lesson with a summary and two sample problems . Solutions & Their Behavior Solution concentration can often be expressed in units of molarity, molality, weight percent, or as ppm. Polar solutions are miscible with other polar solutions, and nonpolar solutions are miscible with other nonpolar solutions. Polar and nonpolar solutions do not mix and form hetereogeneous mixtures. The solubilities of gases and solids in a solution are influenced by pressure and temperature. Colligative properties are independent of a solution’s identity and are dependent on the relative amount of solute.