Question

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Select all of the following that are true about disturbing an equilibrium (Le Chatelier's principle). When an equilibrium is disturbed by adding an additional amount of one of the reactants, the system will response by making more products. When an equilibrium reaction is disturbed by adding more of one of the products, it will shift toward the reactants to return to equilibrium. All of the concentrations will change, but it will return to the same original value of Keg. When an equilibrium is disturbed by adding more of one of the products, the Q value becomes temporarily smaller than Keg: When Q is larger than Keg, the reaction will spontaneously go in the forward direction until equilibrium is re-established. When you add the salt of a conjugate base to a weak acid solution (you are adding one of the products), the pH of that acid solution will go up (less H30+ ions in solution).

Answer 1

1) Adding more reactant, system will response by making more products. True

2) Adding more of product will shift the reaction towards reactant side by making more reactants but Keq will not change. True

3) Adding more product increases the Q value and Q > Keq. Thus the given statement is false.

4) if Q > Keq, then backward reaction is favored. Thus this statement is also false.

5) Consider weak acid CH3COOH and its salt CH3COONa or CH3COONH4. Due to common ion effect. pH will not chane. Thus this statement is also false.

Let me know if any doubts.