Buffer solutions Quiz
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5 questions, one answer each
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1. Which mixture is an acidic buffer?
- A. HCl and NaCl
- B. CH₃COOH and HCl
- C. NaOH and NaCl
- D. CH₃COOH and CH₃COONa
2. A buffer contains 0.10 mol dm⁻³ of a weak acid with pKa 5.00 and 0.10 mol dm⁻³ of its sodium salt. What is its pH?
- A. 5.00
- B. 4.00
- C. 6.00
- D. 7.00
3. What is the pH of a buffer with Ka = 1.0 × 10⁻⁵, [HA] = 0.10 mol dm⁻³ and [A⁻] = 1.0 mol dm⁻³?
- A. 4.00
- B. 5.00
- C. 6.00
- D. 3.00
4. How does the H₂CO₃/HCO₃⁻ buffer in blood remove added H⁺?
- A. H₂CO₃ + H⁺ → H₃CO₃⁺
- B. HCO₃⁻ + H⁺ → H₂CO₃
- C. H₂CO₃ → HCO₃⁻ + H⁺
- D. HCO₃⁻ + OH⁻ → H₂CO₃
5. The pH at the half-neutralisation point of a weak acid titration is 4.60. What is Ka?
- A. 2.5 × 10⁻⁵ mol dm⁻³
- B. 4.6 × 10⁻⁵ mol dm⁻³
- C. 2.5 × 10⁻⁹ mol dm⁻³
- D. 1.0 × 10⁻¹⁴ mol dm⁻³