In aqueous solution ethanoic acid forms an equilibrium mixture with its ions - Scottish Highers Chemistry - Question 20 - 2023
Question 20
In aqueous solution ethanoic acid forms an equilibrium mixture with its ions.
$$\text{CH}_3\text{COOH}(aq) \rightleftharpoons \text{H}^+(aq) + \text{CH}_3\text{COO}... show full transcript
Worked Solution & Example Answer:In aqueous solution ethanoic acid forms an equilibrium mixture with its ions - Scottish Highers Chemistry - Question 20 - 2023
Step 1
A. NaCl(aq)
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Answer
Adding NaCl(aq) would not significantly affect the equilibrium position as NaCl dissociates into Na+ and Cl− ions which do not participate in the reaction, leading to no shift in equilibrium.
Step 2
B. HCl(aq)
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Answer
HCl is a strong acid that will increase the concentration of H+ ions in the solution, pushing the equilibrium to the left, not favoring the forward reaction.
Step 3
C. NaOH(aq)
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Answer
Adding NaOH(aq) adds OH− ions which react with H+ ions to form water, effectively decreasing the concentration of H+ ions. This shift in concentration will favor the forward reaction to regenerate H+ ions.
Step 4
D. CH$_3$COONa(aq)
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Answer
CH3COONa dissociates to provide CH3COO− ions, which are the conjugate base of the weak acid. This will shift the equilibrium to the right, favoring the forward reaction.
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