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17 October, 10:28

Why does Hg2 + have a negative standard entropy

(-32.2J. K-1mol-1) and Hg

22+have a positive standard entropy

(84.5J. K-1mol-1) ?

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  1. 17 October, 11:50
    0
    Hg∧2 + has a negative standard entropy because the ions are highly solvated in aqueous phase; smaller the ionic size, the more highly it is surrounded by solvated ions. Therefore it will be in highly ordered state hence the entropy decreases.

    Hg2 ^2 + has a positive standard entropy because the ionic size of Hg^2 + is smaller than Hg2 ^2+, so therefore the Hg^2 + is highly solvated and that means that it is in highly ordered state. Hg2 ^2 + is not highly solvated so it will have a positive entropy

    Explanation:

    The values of standard entropy of aqueous ions has a negative standard entropy because the ions are highly solvated in aqueous phase; smaller the ionic size, the more highly it is surrounded by solvated ions. Therefore it will be in highly ordered state hence the entropy decreases.

    Hg2 ^2 + has a positive standard entropy because the ionic size of Hg^2 + is smaller than Hg2 ^2+, so therefore the Hg^2 + is highly solvated and that means that it is in highly ordered state. Hg2 ^2 + is not highly solvated so it will have a positive entropy
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