HCl has a lower vapor pressure at a given temperature.
What is vapor pressure?
- Vapor pressure (or vapor pressure in English-speaking countries other than the United States; see spelling differences) is defined as the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases (solid or liquid) in a closed system at a given temperature.
- The equilibrium vapor pressure indicates the rate of evaporation of a liquid.
- It refers to the proclivity of particles to escape from a liquid (or a solid).
- A volatile substance is one that has a high vapor pressure at normal temperatures.
- The pressure exerted by vapor above a liquid surface is referred to as vapor pressure.
To find which has a lower vapor pressure, HF or HCI:
- While HF can form hydrogen bonds with water, HCI will completely dissociate into more charged ions that will interact with water molecules via stronger ion-dipole forces.
- As a result, HCl has a lower vapor pressure.
Therefore, HCl has a lower vapor pressure at a given temperature.
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