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Lattice Energy: Always Positive; Hydration Energy: Always Negative
Chapter 6, Problem 6.66(choose chapter or problem)
Why is the lattice energy of a solid always a positive quantity? Why is the hydration of ions always a negative quantity?
Questions & Answers
QUESTION:
Why is the lattice energy of a solid always a positive quantity? Why is the hydration of ions always a negative quantity?
ANSWER:Step 1 of 2
Lattice energy is the amount of energy required to break apart an ionic solid and convert its component atoms into gaseous ions. It is always a positive quantity for endothermic reaction. It measures the stability of the ionic compounds.
For example: \(\text { Energy }+\mathrm{NaCl}(\mathrm{s}) \rightarrow \mathrm{Na}^{+}(\mathrm{g})+\mathrm{Cl}^{-}(\mathrm{g}) \Delta H_{r x n}^{o}=+787 \mathrm{~kJ} / \mathrm{mol}\)
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Lattice Energy: Always Positive; Hydration Energy: Always Negative
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In this video we clarify why lattice energy in solids is always a positive value due to the energy needed to separate ions making it an endothermic process. On the flip side hydration energy is always negative as it releases heat when ions dissolve in water making it an exothermic reaction. We use sodium chloride as a real-world example to illustrate these crucial thermodynamic concepts