For which salt in the graph above does the solubility increase most rapidly with rise in temperature?

For which salt in the graph above does the solubility increase most rapidly with rise in temperature?

Answer Details

From the graph above, the solubility of a salt increases with an increase in temperature. The salt with the steepest slope on the graph has the most rapid increase in solubility with a rise in temperature. By looking at the graph, it appears that the salt with the steepest slope is KNO3. Therefore, KNO3 is the salt that has the most rapid increase in solubility with a rise in temperature.