Is heat of solution of a chemical related to any of its other properties?

Heat of solution depends on the lattice energy (the energy that is required to break down the crystal lattice of the substance) and the energy of hydration (the energy released when the ions are hydrated, i.e. surrounded by water). In exothermic dissolutions, such as calcium chloride, the energy of hydration is higher than the lattice energy, meaning that more energy is released than is required to break down the lattice, and the solution will be hot. In endothermic dissolutions, such as potassium nitrate, more energy is required to break the crystal apart than is given out by hydration, meaning the solutions will be cold.

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HEAT SOLUTION

As you know, Heat of Solution of a chemical results equal than to Enthalpic Change concerned by Dissolution Phenomenon.

As you know, if Chemical System defined like Liquid Solution need to rise its Enthalpic Containt then ENTHALPIC CHANGE RELATED TO DISSOLUTION PHENOMENON HAS TO BE A POSITIVE ALGEBRAIC AMOUNT. Starting from Gibb's Definition for Enthalpy, this should suggest that dissolution involves Heat Soaking so ENDOTHERMIC DISSOLUTION EFFECTS (e.g. see Ammonium Chloride : it cools down the solution like Doctor Dentist does giving you INSTANTANEOUS ICE).

THERMODYNAMIC POTENTIAL

Like Physical Potentials, Enthalpy obeys to Mathematical Rule known as Double Differentiation of Potentials.

So, once you learnt that

d[G / (R * T)] / d T = - H / (R * T^2)

d[G / (R * T)] / d p = V / (R * T)

where "p" is external pressure acting on system, "T" is Temperature degree of chemical system, "G" is Gibb's Free Energy, "H" is Enthalpy and "V" is occupied volume.

Since Double Differentiation gives you

d[- H / (R * T^2)] / dp = d [V / (R* T)] / dT

you may obtain

d[H / (R * T^2)] / dp = d(V) / [R * T * dT] - V / (R * T^2)

SO, YOU HAVE TO STATE THAT HEAT OF SOLUTION IS RELATED TO DILATABILITY (e.g. mathematical term

d(V) / [R * T * dT] - V / (R * T^2)) OR VOLUME-CHANGE OF FORMIG SOLUTION.

THE LESSER DENSITY OF SOLUTES, THE GREATER RELATED ENTHALPIC EFFECT.

I hope this helps you.