Problem 9.89-Sixth Edition

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Problem 9.89-Sixth Edition

Postby Kate_Santoso_4F » Thu Feb 21, 2019 2:20 pm

Problem 9.89: Some entries for Sm in Appendix 2A are negative. What is common about these entries and why would the entropy be negative?
From what I see, the negative entries all correspond to aqueous ions. Why is this?

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Re: Problem 9.89-Sixth Edition

Postby Chem_Mod » Thu Feb 21, 2019 5:27 pm

Aqueous solutions in Appendix 2A are associated with negative entropies because, they are not necessarily measured in an absolute sense. The values are all measured relative to the entropy of a solution of H+. An aqueous solution have a negative entropy can be thought of forming a solvation shell orienting water molecules in a certain way due to electrostatic interactions (decreasing the entropy).

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