Titration curves and indicators Quiz
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5 questions, one answer each
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1. Which pair of indicator and titration is suitable?
- A. Methyl orange: ethanoic acid with NaOH
- B. Phenolphthalein: HCl with ammonia
- C. Phenolphthalein: ethanoic acid with NaOH
- D. Methyl orange: ethanoic acid with ammonia
2. The pH at the equivalence point of a weak acid with a strong base is above 7 because:
- A. the acid is fully dissociated
- B. the conjugate base of the acid reacts with water to give OH⁻
- C. excess NaOH remains
- D. the salt is neutral
3. A weak acid–strong base titration has pH 4.20 after half of the equivalence volume is added. What is ?
- A. 6.31 × 10⁻⁵ mol dm⁻³
- B. 4.20 mol dm⁻³
- C. 1.58 × 10⁻¹⁰ mol dm⁻³
- D. 6.31 × 10⁻⁹ mol dm⁻³
4. Which titration shows no sharp change in pH?
- A. HCl with NaOH
- B. Ethanoic acid with NaOH
- C. HCl with ammonia
- D. Ethanoic acid with ammonia
5. Why is ΔH neutralisation for ethanoic acid with NaOH less exothermic than for HCl?
- A. Ethanoic acid is more concentrated
- B. Some energy is used to ionise the weak acid
- C. Ethanoic acid does not react with NaOH
- D. Water is not formed