Why is dissolving potassium nitrate in water an endothermic process ? https://socratic.org/questions/5422ba97581e2a47cb1a8acf https://socratic.org/questions/54

Why is dissolving potassium nitrate in water an endothermic process ? https://socratic.org/questions/5422ba97581e2a47cb1a8acf https://socratic.org/questions/5422ba97581e2a47cb1a8acf "Dissolving potassium nitrate in water is an endothermic process because the hydration of the ions when the crystal dissolves does not provide as much energy as is needed to break up the lattice." Huh, which explains why it's reusable, dry it out, grind it up and you can use it again.