This chapter explains the important concepts of water and its properties as per the Class 9 ICSE Chemistry syllabus. Students learn about the composition of water, its physical and chemical properties, purification methods, and its importance in daily life. The chapter also covers concepts related to solutions, hardness of water, and water-related reactions.Key Topics:• Composition and properties of water• Physical and chemical properties• Hard and soft water• Purification of water• Solutions and solubility• Importance of water in life and industry