Question

How is fluorine isolated from fluorides using the Dennis method?

Answer 1

Fluoride is a colourless or white inorganic fluorine monatomic anion with the chemical formula ${{\text{F}}^{\text{-}}}$ . Its salts are generally white or colourless. Fluoride salt has a pronounced bitter flavour and is odourless. Its salts and minerals are significant chemical reagents and industrial chemicals, mostly used to make hydrogen fluoride for fluorocarbon synthesis. Although fluorine is classed as a weak base because it only interacts partly in solution, pure fluoride is corrosive and can cause skin irritation.

Complete answer:
The simplest fluorine anion is fluoride. The fluoride ion is similar to the hydroxide ion in charge and size. Fluoride ions may be found in a variety of minerals, including fluorite, although they are only found in tiny amounts in natural bodies of water.
Dennis' Method was created in 1931 by Dennis, Veeder, and Rochow. Fluorine is produced by electrolysis of fused sodium or potassium hydrogen fluoride in this method (perfectly dry) In a V-shaped electrically heated copper tube, electrolysis takes place between graphite electrodes. Copper caps are used to cover the tube's ends, and bakelite cement is used to secure the graphite electrodes. To avoid heat loss, the copper tubing is heavily lagged.
$\text{KH}{{\text{F}}_{2}}\to \text{KF}+\text{HF}$
${\text{HF}} \to {{\text{H}}^ + } + {{\text{F}}^ - }$
At cathode :- $2 \mathrm{H}^{+}+2 \mathrm{e}^{-} \rightarrow \mathrm{H}_{2}$
At anode $:-2 \mathrm{~F}^{-}-2 \mathrm{e}^{-} \rightarrow \mathrm{F}_{2}$
Fluorine that has been released at the anode is transferred via a U-tube that contains fluorine.
Fluoride (sodium fluoride). This eliminates the fluorine-containing hydrogen fluoride vapours.
$\mathrm{NaF}+\mathrm{HF} \rightarrow \mathrm{NaHF}_{2}$ .

Note:
Fluorine is the 13th most common element in the earth's crust, and it is extensively distributed in nature, completely as fluorides. The great majority is stored in mineral formations, with fluorite being the most economically important ( $Ca{{F}_{2}}$ ). The fluorine cycle is the process through which natural weathering of these rocks, as well as human activities, releases fluorides into the biosphere.