Problem 3.2: The chapter describes dissolution as a

From Chapter 3 Problem Set. Level 1: Conceptual Mastery.

Question

The chapter describes dissolution as a “transaction.” What are the three energetic terms involved, and which one represents the cost, the payoff, and the wildcard?

Answer

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Dissolution involves three energetic terms. Lattice energy is the cost of pulling a crystal apart. Hydration energy is the payoff released when water stabilizes the separated species. Entropy is the wildcard: dispersion tends to favor dissolution, while solvent ordering can oppose it. Gibbs free energy combines these effects and tells you whether dissolution is favored.