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Introduction Aim My aim is to find the solubility of potassium nitrate in water at different temperatures and to estimate the solubility of potassium nitrate at 50ºC, and estimate the approximate value for the enthalpy of solution of potassium nitrate in water. Background Knowledge Enthalpy is the amount of energy possessed by a thermodynamic system for transfer between itself and its environment. For example, in a chemical reaction, the change in enthalpy of the system is the heat of the reaction. In a phase change, as from a liquid to a gas, the change in enthalpy of the system is the latent heat of vaporization. In a simple temperature change, the change in enthalpy with each degree is the heat capacity of the system at constant pressure. The German physicist Rudolf J.E. Clausius originated the term in 1850. Mathematically, enthalpy H is identified as U + PV, where U is internal energy, P is...

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