What makes hydrofluoric acid from fluorite ?
Answer:
Sulphuric acid "In the reaction of phosphate-containing fluorspar with sulphuric acid to produce gaseous hydrofluoric acid, withdrawing the hydrofluoric acid and condensing it, the improvement which comprises adding to the fluorspar a reactive iron compound in an amount approximately equivalent to the phosphate content whereby the phosphate content of the condensed hydrofluoric acid is markedly diminished. The reactive iron compound can be contained in another fluorspar which is blended in the first fluorspar in the requisite amount and/or it can be an iron oxide, fluoride or sulphate, or a hydrated or hydratable iron compound added to the phosphate-containing fluorspar in about 0.2 to 5% by weight calculated as Fe.sub.2 O.sub.3 content and based on the fluorspar. " Don't try this at home.
Use concentrated sulfuric acid:
CaF2 + H2SO4 -> CaSO4 + 2HF
The reaction ought to be carried out in a plastic container because hydrofluoric acid is strong enough to dissolve glass or metal.
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