Question

$KF$ combines with $HF$ to from $KH{F}_2$ The compound contains the species:

• A. $K^{+},F^{-}and{H}^{+}$
• B. $K^{+},F^{-}andHF$
• C. $K^{+}and[H{F}_2{]}^{-}$
• D. $[KHF{]}^{+}and{F}_2$

Answer 1

The correct option is C $K^{+}and[H{F}_2{]}^{-}$

$KF\to K^{+}+F^{-}$

$F^{-}+HF\to {\left[H{F}_2\right]}^{-}$

$KH{F}_2$ is formed by the ions, $K^{+}$ and ${HF}_2^{-}$. ${HF}_2$ is a covalent compound. Hydrogen bonding exists between $F^{-}$ and $HF$.