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22 Οκτ 2019 · When hydrogen fluoride is dissolved in water, hydrofluoric acid is formed. HF forms orthorhombic crystals below −83.6 °C (−118.5 °F), consisting of zig-zag chains of HF molecules. The HF molecules, with a 95 pm length H–F bond, are linked to nearby molecules by intermolecular H–F Hydrogen.
This page discusses the acidity of the hydrogen halides: hydrogen fluoride, hydrogen chloride, hydrogen bromide and hydrogen iodide. It begins by describing their physical properties and synthesis and then explains what happens when they react with water to make acids such as hydrofluoric acid and hydrochloric acid.
In fact, the highest bonding energy for the hydrogen bond is obtained when the two electronegative atoms (fluorine here) are approximately in line with the electropositive hydrogen atom in between (O⋅⋅⋅H−O O ⋅ ⋅ ⋅ H − O in water, F⋅⋅⋅H−F F ⋅ ⋅ ⋅ H − F in hydrogen fluoride).
Hydrogen fluoride does not boil until 20 °C in contrast to the heavier hydrogen halides, which boil between −85 °C (−120 °F) and −35 °C (−30 °F). [6] [7] [8] This hydrogen bonding between HF molecules gives rise to high viscosity in the liquid phase and lower than expected pressure in the gas phase.
30 Ιαν 2023 · A hydrogen bond is an intermolecular force (IMF) that forms a special type of dipole-dipole attraction when a hydrogen atom bonded to a strongly electronegative atom exists in the vicinity of another electronegative atom with a lone pair of electrons.
23 Ιουν 2023 · Hydrogen bonding between HF molecules is particularly evident in solid HF, where the atoms are arranged in a zigzag pattern: Here the distance between hydrogen and fluorine nuclei in different molecules is only 150 pm.
2 ημέρες πριν · Hydrogen fluoride is a colorless liquid or a gaseous compound having the chemical formula HF. It tends to dissolve in water and the colorless aqueous solution is known as hydrofluoric acid. It has a melting point of -118.50 F and a boiling point of about 670 F. HF has a molar mass of 20.0064 g/mol and a density of 1.15 g/litre as a gas at 250 C.
