The solubility of potassium nitrate KNO3 in water is directly affected by temperature. As the temperature of the water increases, the solubility of potassium nitrate also increases. This means that more KNO3 can dissolve in water at higher temperatures compared to lower temperatures.This relationship can be represented by a solubility curve, which is a graph that shows the solubility of a solute in this case, KNO3 in a solvent water as a function of temperature. For potassium nitrate, the curve has a positive slope, indicating that solubility increases with increasing temperature.For example, at 20C 68F , the solubility of KNO3 in water is approximately 32 grams per 100 grams of water. At 40C 104F , the solubility increases to about 64 grams per 100 grams of water. This trend continues as the temperature increases, allowing more KNO3 to dissolve in the water.It is important to note that this relationship is specific to potassium nitrate and water, and may not apply to other solute-solvent combinations. Some solutes may have a negative slope on their solubility curve, indicating that their solubility decreases with increasing temperature.