Fluorohydric acid

Fluoroform. SeeTrifluoromethane Fiuorogiide FL 1690, Fiuorogiide FL 1700. See Polytetrafluoroethylene Fluorohydric acid. See Hydrofluoric acid Fluoroimide. See 2,3-Dichloro-N-4-fluorophenylmaleimide... 

Synonyms Fluohydric acid Fluorohydric acid Hydrogen fluoride White acid... 

Magnesium oxide MgO used as chemical buffer of reaction products that have an acidic character. For instance, MgO is a necessary ingredient in the curing formulation of fluoroelastomers where it captures the fluorohydric acid (HF) resulting from chains bonding. 

Due to an instability of dissolver solution toward the formation of zirconium and aluminum fluorohydrates at lower acid levels, decreasing the acidity before actinide separation is impractical. 

Boron analysis by measuring the methyleneblue-BF]j complex after extraction with 1.2-dichlorethane is proposed by Meier et al. (20) as a very sensitive and reliable method for boron determinations in aluminium. 1 g of aluminium is dissolved in sodium hydroxide in a quartz beaker under heating and addition of some sodium peroxide. The solution is cooled, acidified with sulphuric acid and warmed up again until it clarifies. After cooling, the solution is transferred into a 250 ml calibrated quartz flask and diluted to the mark with water. 25 ml of this solution are then mixed with 5 ml hydrofluoric acid (5 %) and 10 ml 0.001 M methyleneblue solution in a plastic beaker and allowed to stand for 1 hour. The pH-value should be 2 + 0.2. The solution is then shaken with 25 ml 1.2-dichlorethane during 1 min. The complete separation of the phases needs 30 min. To eliminate interferences (especially from coextracted methyleneblue fluorohydrate), the extract is washed with 10 ml sodium nitrate solution (3 %), filtered... 

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See also in sourсe #XX -- [ ]

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