In this chemistry lesson, the focus was on understanding solubility curves of gases and salts, examining how their solubility changes with temperature. It was explained that as temperature increases, the solubility of gases like ammonia (NH3) and sulfur dioxide (SO2) decreases, whereas the solubility of salts such as potassium nitrate (KNO3) and potassium chloride (KCl) increases. Students learned to interpret these patterns through a practical example, determining that 60 degrees Celsius is the temperature required to dissolve 45 grams of potassium chloride in 100 grams of water.