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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ie160

Each of the following solutions is prepared from a weak acid HA () in water. For which does pH = 4.80? (Assume ideal behaviour.)

  1. A100 mL 0.20 M HA + 100 mL 0.10 M NaOH
  2. B100 mL 0.10 M HA + 100 mL 0.10 M NaA
  3. C100 mL 0.20 M HA + 150 mL 0.10 M NaOH
  4. D60 mL 0.10 M HA + 60 mL 0.10 M NaA + 120 mL water

Answer: A, B, D

(a) HA 20-10 = 10 mmol, A- 10 mmol: ratio 1. (b) 10 mmol each: ratio 1. (c) HA 20-15 = 5 mmol, A- 15 mmol: ratio 3, pH = 5.28. (d) equal moles, dilution does not change the ratio: pH = pKa.
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