pH curves, titrations and indicators Quiz
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5 questions, one answer each
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1. A 25.0 cm³ sample of NaOH needs 20.0 cm³ of 0.100 mol dm⁻³ HCl. What is the NaOH concentration?
- A. 0.0800 mol dm⁻³
- B. 0.125 mol dm⁻³
- C. 0.0500 mol dm⁻³
- D. 0.200 mol dm⁻³
2. Which titration curve has no vertical section?
- A. Strong acid with strong base
- B. Weak acid with strong base
- C. Strong acid with weak base
- D. Weak acid with weak base
3. Which indicator is suitable for ethanoic acid titrated with sodium hydroxide?
- A. Methyl orange
- B. Either indicator
- C. Phenolphthalein
- D. Neither indicator
4. What is the approximate pH range of the vertical section for hydrochloric acid titrated with ammonia?
- A. 3 to 11
- B. 3 to 7
- C. 7 to 11
- D. 1 to 3
5. What is the starting pH of 0.1 mol dm⁻³ ethanoic acid compared with 0.1 mol dm⁻³ hydrochloric acid?
- A. Lower
- B. The same
- C. Higher, because the acid is only partly dissociated
- D. Higher, because it is more concentrated