Homework Le Chateliers Principle 2. main will shift For the equilibrium in optio
ID: 516672 • Letter: H
Question
Homework Le Chateliers Principle 2. main will shift For the equilibrium in option A state how the made (if any), and according to the indicated changes, state the observation that would be determine how the overall amounts of the component species will be affected. Main Equilibrium Change a. Dircction of shift of the main equilibrium b. Observation (s) c. Changes in overall amounts (write the formulas for each component of the main equilibrium in the spaces provided) increase decrease same decrease same Increase decrease same increase increase decrease same hange a. Direction of shift of the main equilibrium b. Observation(s) c. Changes in overall amounts (write the formulas for each component of the main equilibrium in the spaces provided) increase decrease same increase decrease same increase decrease same decrease same increaseExplanation / Answer
Note: According to Chalier's principle, which is strictly valid only for chemical reactions under equilibrium:
Now, by applying the above concept, we can easily get the answers to above questions.
Answer:
2. NH3 (aq) + H2O (l) <=> NH4+ (aq) + OH- (aq)
Change 1
a. Direction of shift of the main equiibrium:
The addition of ammonia (NH3) will drive the reaction in forward direction.
b. Observation:
As the forward reaction involves formation of OH-, which can lead to solution pH or basicity. Therefore, a pH increase will be observed.
c. Changes in overall amounts:
NH3 (aq) increase (because of addition)
H2O (l) decrease (because extra NH3 addition will react with H2O)
NH4+ (aq) increase (because of more product formation)
OH- (aq) increase (because of more product formation)
Change 2
a. Direction of shift of the main equiibrium:
The increase in temperature of the chemical reaction. This will lead to the evaporaton of dissolved ammonia (NH3) in water, Therefore, with lowering of reactant concentration, the reaction will drive the reaction in backward direction.
b. Observation:
As the backward reaction involves decrease in concentrtation of OH-, which can lead to solution pH or acidity. Therefore pH of the solution will decrease.
c. Changes in overall amounts:
NH3 (aq) decrease (because of evaporation)
H2O (l) increase (because of less NH3 availibity for reaction)
NH4+ (aq) decrease (because to restore the loss of NH3 due to evaporation)
OH- (aq) decrease (because to restore the loss of NH3 due to evaporation)
Answer 2
Change 1: An addition of magnesium chloride will introduce Mg2+ in the main reaction. The added Mg2+ will react with OH- (see relevant reaction) and thus will lead to the reduction of OH- in the Main reaction. Consequently, the equilibrium will shift in forward direction to restore the lost amount of OH-.
Change 2: An addition of copper sulfate will introduce Cu+ in the main reaction. The added Cu+ will react with NH3- (see relevant reaction) and thus will lead to the reduction of NH3- in the Main reaction. Consequently, the equilibrium will shift in backward direction to restore the lost amount of NH3-.
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