Titration curves and indicators Quiz
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5 questions, one answer each
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1. A strong acid is titrated with a strong base. What is the pH at the equivalence point?
- A. Below 7
- B. Above 7
- C. Depends on the indicator
- D. Exactly 7
2. Which indicator is suitable for titrating ethanoic acid with sodium hydroxide?
- A. Methyl orange (3.1–4.4)
- B. Bromophenol blue (3.0–4.6)
- C. Phenolphthalein (8.3–10.0)
- D. Methyl red (4.2–6.3)
3. What is the shape of a weak acid with weak base titration curve?
- A. Two vertical sections
- B. A long vertical section at pH 7
- C. No sharp vertical section
- D. A horizontal line
4. 25.0 cm³ of 0.0500 mol dm⁻³ ethanedioic acid (diprotic, pKa values 1.25 and 4.27) is titrated with 0.100 mol dm⁻³ NaOH. At what volume is the first equivalence point?
- A. 6.25 cm³
- B. 12.5 cm³
- C. 25.0 cm³
- D. 50.0 cm³
5. Why is methyl orange unsuitable for a weak acid with a strong base?
- A. Its colour change occurs in the buffer region, before the vertical section
- B. It changes colour after the equivalence point
- C. It is a base
- D. It changes colour at pH 14