This chapter explains the concept of solutions, their types, and concentration terms such as molarity, molality, and mole fraction. It covers the dissolution process, solubility of gases and solids in liquids, and factors affecting solubility. Students also learn about colligative properties like relative lowering of vapour pressure, elevation of boiling point, depression of freezing point, and osmotic pressure. These concepts help determine the molecular masses of solutes and understand the behavior of solutions.

In short: Chapter 1 introduces the properties, concentration, and behavior of solutions, along with important colligative properties and their practical applications.