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\( \mathrm{KF} \) combines with \( \mathrm{HF} \) to form \( \mathrm{KHF}_{2} \). The compound contains the species :
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(1) \( \mathrm{K}^{+}, \mathrm{F}^{-} \)and \( \mathrm{H}^{+} \)
(2) \( \mathrm{K}^{+}, \mathrm{F}^{-} \)and \( \mathrm{HF} \)
(3) \( \mathrm{K}^{+} \)and \( \left[\mathrm{HF}_{2}\right]^{-} \)
(4) \( [\mathrm{KHF}]^{+} \)and \( \mathrm{F}_{2} \)
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