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Correct Answer: A
Correct Answer: A
Method / Topic: General Chemistry
The correct option matches the required rule and the given information.
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Correct Answer: A
Method / Topic: General Chemistry
Sodium acetate supplies CH3COO−, a product of acetic acid dissociation. Increasing a product shifts CH3COOH ⇌ H+ + CH3COO− toward undissociated acid by Le Châtelier's principle. This is the common-ion effect. Sodium ion is essentially a spectator and does not completely neutralize acetic acid. This result follows from the balanced chemical relationship and the stated conditions; no unstated biological assumption is needed. On MCAT chemistry problems, first identify the governing principle, write the relevant equation with units, and only then substitute values. Check whether the
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PASSAGE 3 — ACETATE BUFFER A researcher prepares 1.00 L of a buffer containing 0.100 mol CH3COOH and 0.100 mol CH3COO−. The acid dissociation constant of acetic acid is Ka = 1.8 × 10−5, so pKa ≈ 4.76. Volume changes after small additions may be neglected. The Henderson–Hasselbalch equation is pH = pKa + log([A−]/[HA]). QUESTION 9: Adding sodium acetate to an acetic acid solution suppresses acid ionization primarily because of
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Correct Answer: A
Method / Topic: General Chemistry
The correct option matches the required rule and the given information.
Short Explanation
Detailed Explanation
Correct Answer: A
Method / Topic: General Chemistry
Sodium acetate supplies CH3COO−, a product of acetic acid dissociation. Increasing a product shifts CH3COOH ⇌ H+ + CH3COO− toward undissociated acid by Le Châtelier's principle. This is the common-ion effect. Sodium ion is essentially a spectator and does not completely neutralize acetic acid. This result follows from the balanced chemical relationship and the stated conditions; no unstated biological assumption is needed. On MCAT chemistry problems, first identify the governing principle, write the relevant equation with units, and only then substitute values. Check whether the
prevents dosage, dilution, and preparation errors.
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