"On the Boiling Point of Hydrogen Fluoride"

The world has discussed the physical properties of hydrogen fluoride. The boiling point of hydrogen fluoride, the difference in its boiling point, has attracted the attention of everyone.

Looking at all gases, the general principle is based on the molecular weight, probably the larger the molecular weight, the higher the boiling point. However, hydrogen fluoride is unique from this. Although its molecular weight is not the largest in the hydrogen halide family, its boiling point is quite high.

The reason for this is that there are hydrogen bonds between hydrogen fluoride molecules. Although hydrogen bonds are not chemical bonds, their force is stronger than van der Waals force. The existence of this hydrogen bond enhances the interaction between hydrogen fluoride molecules. To make it gasify, more energy is required, which increases the boiling point.

Other hydrogen halides, such as hydrogen chloride, hydrogen bromide, and hydrogen iodide, are also compounds of halogen elements and hydrogen, but there is only van der Waals force between their molecules, without the help of hydrogen bonds, so the boiling point is lower than that of hydrogen fluoride.

From this point of view, if you want to understand the boiling point of hydrogen fluoride, you must study the hydrogen bond. Knowing this, the solution of physical properties is further advanced.