ndeed this is an Endothermic reaction. Def: The reaction absorbs heat while in progress. This heat that it absorbs is obtained from the \"latent heat\" of water making the solution effectively cooler. There is no bond forming between water and Potassium Nitrate. The molecules are interspersed withing the molecules of water. This intermingling of molecules is the one that absorbs energy from the latent heat of water. Hope it clarifies. Solution ndeed this is an Endothermic reaction. Def: The reaction absorbs heat while in progress. This heat that it absorbs is obtained from the \"latent heat\" of water making the solution effectively cooler. There is no bond forming between water and Potassium Nitrate. The molecules are interspersed withing the molecules of water. This intermingling of molecules is the one that absorbs energy from the latent heat of water. Hope it clarifies..