Acids fluoric

Fluorhydric Acid Fluoric Acid Fluorid Sodny Fluorine... 

Fluoric Acid. It could be applied to HFOa if it existed, but now it is sometimes erroneously used for hydrofluoric acid, HF... 

Fluoric acid 6 FI25 Fluoride 6 FI25 Fluorimide6 F134... 

On the whole, it must be admitted that etching by fluoric acid, though practised to some extent, and in some particular cases with marked success, has not been found effective for general purposes. It is usefully applied, however, to form the scales on thermometer tubes, and written or printed inscriptions on glass vessels. The attempt to make it subservient to typographical purposes has been a failure. 

Therefore, fluoric acid should never be filled into glass containers Be careful while handling fluoric acid. It is a strong acid, very toxic, and causes severe burns. 

It is apparent from Table 11.12 that ternary acids of fluorine are unknown. There is, however, some evidence that salts of hypofluorous and fluoric acids exist in solution. 

Although the basic chemical reactions have been thought, for many years, to be similar with either sulfuric or hydro -fluoric acid catalyst, extensive work with sulfuric acid described by Albright et al (24) has demonstrated that this is probably not the case. The need for more detailed work with hydrofluoric acid is cited. The following summarizes their report "The reaction mechanism for hydrogen fluoride alkylation also seems to be radically different than that for sulfuric acid alkylation. The alkylation mechanism which has been widely accepted in the past seems to be somewhat more satisfactory for hydrogen fluoride alkylation even though it is not for sulfuric acid... 

During the early stages of fermentation the growth of harmful bacteria is checked, in the past lactic acid was used, but now antiseptics, to which the selected yeast has been acclimatized, are employed. The following substances have been used bismuth nitrate, calcium bisulphite, hydro-fluoric acid, ammonium fluoride, the latter being now most in favour. 

Hydrofluoric acid 3960 HF Fluoric acid hydrogen fluoride. 

To Obtain Fluoric Acid. Tho anhydrous acid is made by distilling powdered fiuor-spar with twice its weight of oil of vitriol in a leaden, or better, a stiver alembic, the pipe of which fits into a bottle of tho same material, Burronnded with ice. But as it is usually required in a dilated state, water equal in weight to the spar may be put into the receiver. Great care must be men, as the acid, both in its gaseous and liquid form, is very destructive. 

Fluid Extract of Bearberry 4577 Fluoric Acid, to obtain.3061... 

While the diazotization is in process, 68 g. (x.i moles) of boric acid is dissolved in 133 g. (4 moles) of 60 per cent hydro-fluoric acid (Note 2) in a beaker coated with paraffin-wax. The temperature is kept below 250 to avoid melting the paraffin-wax (Note 3). 

In 1771 Scheele was the first to recognise in fluorspar the calcium salt of a new acid which latter he obtained later by distillation of fluorspar with sulphuric acid using a tin retort, fie called the product fluoric acid and in 1807 Gay-Lussac and Thenard prepared the anhydrous acid. In accordance with Lavoisier s theory the acid was regarded as a compound of water with the oxide of an element fluorium and hence contained oxygen. 

The most common approach to phosphorus determination is the assessment of phosphate in wet chemistry. Therefore, the majority of samples should be dissolved before analysis. Solid samples are decomposed by alkali or acid treatment silicate is dissolved by treatment with fluoric acid. Samples of biological material are reduced to ash using an appropriate laboratory oven or are digested with hot oxidative acids. A direct phosphate assessment is advised only in some water samples. The determination of total phosphoms is not used to identify soil fertility due to phosphorus content rather, water extracts are used of various pH and ionic strength. 

---