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When potassium fluoride reacts with hydrofluoric acid to give KHF₂, which ionic species are present in the compound?

1. K⁺, F⁻ and H⁺
2. K⁺, F⁻ and HF
3. K⁺ and [HF₂]⁻
4. [KHF]⁺ and F₂

Correct answer: K⁺ and [HF₂]⁻

Solution

In the compound KHF₂, potassium (K⁺) acts as a cation while the anion is the bifluoride ion ([HF₂]⁻), which is formed from the interaction of hydrofluoric acid and fluoride ions, thus making option C the correct choice.

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