R3.1 Proton transfer reactions Quiz
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5 questions, one answer each
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1. A solution at 298 K has pOH 3.40. What is its pH?
- A. 3.40
- B. 7.00
- C. 10.60
- D. 17.40
2. Which acid is the weakest?
- A. pKa 3.75
- B. pKa 4.20
- C. pKa 4.76
- D. pKa 9.25
3. Which salt gives a basic aqueous solution?
- A. NaCl
- B. NH₄NO₃
- C. KNO₃
- D. Na₂CO₃
4. Which indicator suits a titration of aqueous ammonia with hydrochloric acid?
- A. Phenolphthalein (8.2–10.0)
- B. Methyl red (4.4–6.2)
- C. Thymol blue (8.0–9.6)
- D. None — no indicator works
5. Which mixture forms an acidic buffer?
- A. HCl and NaCl
- B. CH₃COOH and CH₃COONa
- C. NH₃ and NH₄Cl
- D. NaOH and CH₃COONa