if NaCl is added to this equation:
[Co(OH2)6]2+ + 4 Cl- + heat ->(supposed to be double arrow) [CoCl4]2- + 6 H2O
would the equilibrium shift right or left? also same question for the addition of AgNO3.
Remember Le Chatelier's Principle. When a system at equilibrium is subjected to a stress, the reaction will shift in a direction to relieve the stress.
So, if we ADD NaCl to the reaction at equilibrium, it will shift (to the right or to the left) so as to use up the Cl^- added. How can it do that. If it shifts to the right, the Cl^- is used up. If it shifts to the left, Cl^- is formed. So which will it do?
If AgNO3 is added, what will happen? Remember that AgNO3 reacts with NaCl to form a solid, AgCl. So the AgNO3 will REMOVE Cl^- from solution (by forming the insoluble ppt of AgCl) and the reaction then must shift (again, right or left) so as to try to replace the Cl^- that has been removed. Which way will that be?
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To determine the effect of adding NaCl or AgNO3 to the given equation, we should consider Le Chatelier's Principle.
According to Le Chatelier's Principle, when a stress is applied to a system at equilibrium, the equilibrium will shift in the direction that counteracts that stress to restore equilibrium.
1. Addition of NaCl:
When NaCl is added, it increases the concentration of chloride ions (Cl-) in the system. Since chloride ions are present on the reactant side, increasing their concentration will increase the reaction rate to consume the additional chloride ions. Consequently, the equilibrium will shift to the right to form more products. Therefore, the addition of NaCl will shift the equilibrium to the right.
2. Addition of AgNO3:
When AgNO3 is added, it increases the concentration of silver ions (Ag+) in the system. Since silver ions are not present in the original equation, their presence will not directly affect the equilibrium. Therefore, adding AgNO3 will not cause a shift in the equilibrium position of the reaction.
In summary, adding NaCl will shift the equilibrium to the right, while adding AgNO3 will not cause a shift in the equilibrium position.