Question

Product the shift in equilibrium when the volume is decreased on the following equilibrium reactions:
(i) ${\mathrm{PCl}}_3(\mathrm{g})+{\mathrm{Cl}}_2(\mathrm{g})\rightleftarrows {\mathrm{PCl}}_5(\mathrm{g})$

Answer 1

1. According to Le Chatelier's principle if a system in equilibrium is subjected to a change in concentration, pressure or temperature, the equilibrium shifts in the direction that tends to reduce the effect of the change.
2. According to Le Chatelier's principle when there is a decrease in volume, there will be an increase in the pressure of the system, then to counteract this increase in pressure, the equilibrium will shift to the direction which gives fewer moles of gas.
3. Here the equilibrium will shift in the forward direction which has a less number of moles of gas.