Example for liquid vapour equilibrium
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H2O(l) ⇌ H2O (vap)
HERE YOU GO!
Experiment:
Place a drying agent like anhydrous calcium chloride for a few hours in a transparent box with a U-tube containing mercury i.e. manometer. This will soak up all the moisture in the box.
Remove the drying agent by tilting the box to one side and quickly place a petri dish containing water.
Observations:
The mercury in the manometer rises slowly and then attains a constant value. This is because the pressure inside the manometer increases due to the addition of water molecules into the gaseous phase.
Initially, there is no water vapour in the box. As the water in the petri dish evaporates, the volume of water in the petri dish decreases and the pressure in the box increases.
The rate of increase in pressure decreases with time because of condensation of vapour into water.
Finally, it reaches an equilibrium where there is no net evaporation or condensation.
HERE YOU GO!
Experiment:
Place a drying agent like anhydrous calcium chloride for a few hours in a transparent box with a U-tube containing mercury i.e. manometer. This will soak up all the moisture in the box.
Remove the drying agent by tilting the box to one side and quickly place a petri dish containing water.
Observations:
The mercury in the manometer rises slowly and then attains a constant value. This is because the pressure inside the manometer increases due to the addition of water molecules into the gaseous phase.
Initially, there is no water vapour in the box. As the water in the petri dish evaporates, the volume of water in the petri dish decreases and the pressure in the box increases.
The rate of increase in pressure decreases with time because of condensation of vapour into water.
Finally, it reaches an equilibrium where there is no net evaporation or condensation.
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