The heat of solution or enthalpy of solution is the heat/enthalpy required to the solute to dilute in the solvent.

There are three steps and depending in each of the step the nature of the final enthalpy change (either positive or negative)

Course is based on the next Texbook:

-Thermodynamics: An Engineering Approach by Yunus Çengel and
Michael Boles

Check out the Thermodynamic Course Playlist here:
http://goo.gl/JwCi0F

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