Hydrogen fluoride strength

In dilute aqueous solution hydrogen fluoride is a weak acid but the acid strength increases with the concentration of hydrogen fluoride. 

Specifications, Shipping, and Analysis. Hydrogen fluoride is shipped in bulk in tank cars (specification 112S400W) and tank tmcks (specification MC312). A small volume of overseas business is shipped in ISO tanks. Bulk shipments are made of anhydrous HF as well as 70% aqueous solutions. A small amount of aqueous solution may be shipped as 50%. Cars and tmcks used for anhydrous HF transport are of carbon steel constmction. It is possible to ship 70% aqueous in steel from a corrosion standpoint however, mbber lining is commonly used to eliminate iron pickup, which is detrimental to product quaUty in a number of appHcations. Hydrogen fluoride of less than 60% strength must always be shipped in lined containers. 

Protogenic solvents are acidic in nature and readily donate protons. Anhydrous acids such as hydrogen fluoride and sulphuric acid fall in this category because of their strength and ability to donate protons they enhance the strength of weak bases. 

Although fluorides play a crucial Role in some Ir-catalyzed reactions [9,41], experimental information regarding relevant Ir-fluoride complexes is scarce. Vaska-type fluoride complexes have been reported but are not well characterized [42], while structurally characterized Ir-fluorides are even rarer [43]. Crabtree and coworkers estimated the hydrogen bridge strength of the F. .. H interaction in complexes 62 and 63 (see below) to be approximately 5-7kcalmol [29]. On the other hand,... 

These products are thermally stable at room temperature but decompose at elevated temperatures by ehmination of CF2 The reaction with hydrogen fluoride is different from that with hydrogen chloride and hydrogen bromide Presumably this difference is derived from the strength of the boron-fluonne bond [108] (equation 86)... 

Preferential elimination of hydrogen fluoride from vicinal halofluoro compounds occurs also in the cyclohexane series [55 56, 57], acenaphthene series [53], and benzodihydrofuran senes [59 60] Here, the strength of the base and the stereochemistry play important roles... 

Hydrogen fluoride is a weak acid in aqueous solution, pKa = 3.45, due to the strength of the H-F bond. This bond strength also accounts for the basicity of the fluoride ion. 

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