In this chemistry lesson, we explore the concepts of acidity and basicity, focusing on how acids behave when dissolved in water, specifically the formation of hydrogen ions (H+) and their properties. Strong acids, like hydrochloric acid, fully dissociate into H+ and chloride ions in solution, while weak acids, such as ethanoic acid, only partially dissociate. By the end of the lesson, students will understand the differences between strong and weak acids and their corresponding pH values.