Weak acids, Ka, Kw and strong bases Quiz
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5 questions, one answer each
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1. Which is the correct unit for Ka of a monoprotic weak acid?
- A. mol dm⁻³
- B. mol² dm⁻⁶
- C. dm³ mol⁻¹
- D. No units
2. What is the pH of 0.0200 mol dm⁻³ NaOH at 25 °C?
- A. 1.70
- B. 13.70
- C. 12.70
- D. 12.30
3. A weak acid has Ka = 1.0 × 10⁻⁶ mol dm⁻³ and concentration 0.010 mol dm⁻³. What is its pH?
- A. 4.00
- B. 3.50
- C. 6.00
- D. 2.00
4. Which acid is the strongest?
- A. pKa 4.76
- B. pKa 3.14
- C. pKa 9.25
- D. pKa 6.37
5. 0.100 mol dm⁻³ ethanoic acid is diluted tenfold. Which statement is correct?
- A. The pH rises by 1.00, as for a strong acid
- B. The pH falls because there is less acid
- C. The pH rises by about 0.5 because more of the acid dissociates
- D. The pH is unchanged because Ka is constant