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# Solution: For the dissociation reaction of the acid HF HF ⇌ H+ + F - ΔS is observed to be negative. The BEST explanation for this is: A. This is the expected result since each HF molecule produces two ions when it dissociates. B. Hydration of the ions produces the negative value of ΔS. C. The reaction is expected to be exothermic and thus ΔS should be negative. D. The reaction is expected to be endothermic and thus ΔS should be negative. E. None of these can explain the negative value of ΔS.

###### Problem

For the dissociation reaction of the acid HF

HF ⇌ H+ + F -

ΔS is observed to be negative. The BEST explanation for this is:

A. This is the expected result since each HF molecule produces two ions when it dissociates.

B. Hydration of the ions produces the negative value of ΔS.

C. The reaction is expected to be exothermic and thus ΔS should be negative.

D. The reaction is expected to be endothermic and thus ΔS should be negative.

E. None of these can explain the negative value of ΔS.