Question

$\mathrm{KF}$ combines with $\mathrm{HF}$ to form ${\mathrm{KHF}}_2$. The compound contains the__________ species.

Answer 1

Potassium fluoride and Hydrogen fluoride:

1. Hydrogen fluoride is a fluorine-containing chemical compound. It might be in the form of a gas, a fuming liquid, or dissolved in water.
2. Potassium fluoride is a white crystalline powder that can be found in nature but is rare.
3. Both of these compounds are primary sources of fluoride ion
4. In hydrogen fluoride, potassium iodide is soluble, but not in alcohol.
5. Potassium iodide reacts with hydrogen fluoride to give Potassium Bifluoride.
6. $\underset{\mathrm{Potassium}\mathrm{fluoride}}{\mathrm{KF}\left(\mathrm{s}\right)}+\underset{\mathrm{Hydrogen}\mathrm{fluoride}}{\mathrm{HF}\left(\mathrm{l}\right)}\to \underset{\mathrm{Potassium}\mathrm{bifluoride}}{{\mathrm{KHF}}_2\left(\mathrm{s}\right)}$
7. Potassium Bifluoride is a colorless salt that contains the potassium cation as well as the fluoride anion.
8. With the help of hydrogen bonding Potassium bifluoride ion is formed.
9. $\underset{\mathrm{Potassium}\mathrm{bifluoride}}{{\mathrm{KHF}}_2\left(\mathrm{s}\right)}\to \underset{\mathrm{Potassium}\mathrm{cation}}{{\mathrm{K}}^{+}}+\underset{\mathrm{Bifluoride}\mathrm{anion}}{{\left[{\mathrm{HF}}_2\right]}^{-}}$

Therefore, $\mathrm{KF}$ combines with $\mathrm{HF}$ to form ${\mathrm{KHF}}_2$. The compound contains ${\mathrm{K}}^{+}$ and ${\left[{\mathrm{HF}}_2\right]}^{-}$ions.