(2007? Qinghai) solubility curve expressed as KNO3 NaCl: (1) What information can be obtained from the chart: (write at least two) ① _ _ _ _

(1) From the solubility curve, we can know the solubility of the substance at a certain temperature, the solubility of the reference substance, the change of solubility with temperature, etc.

(2) According to the solubility curve of KNO3, the solubility of KNO3 increases with the increase of temperature; The method to make the saturated potassium nitrate solution continue to dissolve potassium nitrate is to increase the temperature or add water;

Answer: (1) ① the solubility of kno3 increases with the increase of temperature; ② ② The solubility of KNO _ 3 _ 3 is greatly influenced by temperature, while the solubility of sodium chloride is not.

(2) heating up; Add water.