How to say lattice energy is greater than hydration energy?
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If the hydration energy is equal to or greater than the lattice energy, then the salt is water-soluble. In salts for which the hydration energy is higher than the lattice energy, solvation occurs with a release of energy in the form of heat.
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If the hydration energy is greater than the lattice energy, then the enthalpy of solution is negative (heat is released), otherwise it is positive (heat is absorbed). ... If the solvation energy is positive, then the solvation process is endergonic; otherwise, it is exergonic.
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