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When an acid donates a proton, the species that remains is referred to as its conjugate base. H2O ⇌ H+ + OH^- HF ⇌ H+ + F^-

1. The conjugate base is OH^-
2. The conjugate base is F^-
3. The conjugate base is H+
4. None of the above

Correct answer: The conjugate base is F^-

Solution

The conjugate base is formed when an acid donates a proton (H+). In the case of HF, when it loses H+, the resulting species is F^-, which is its conjugate base.

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