Titrations Quiz
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5 questions, one answer each
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1. What does a titration measure?
- A. The mass of a solid product formed in a reaction
- B. The volumes of an acid and alkali that react exactly with each other
- C. The rate of a chemical reaction
- D. The temperature change during neutralisation
2. Which piece of apparatus is used to add the second solution gradually while accurately measuring its volume?
- A. Measuring cylinder
- B. Pipette
- C. Burette
- D. Conical flask
3. What is meant by the 'end point' of a titration?
- A. The moment the burette is completely empty
- B. The point at which the indicator permanently changes colour, showing exact neutralisation
- C. The point at which the solution starts to boil
- D. The final reading taken before the experiment begins
4. Why are repeat titrations carried out and only concordant results used to calculate the mean titre?
- A. To make the experiment take longer
- B. To reduce the effect of random errors and exclude anomalous results
- C. Because a single titration is not allowed by the specification
- D. To use up all of the acid in the burette
5. A student is asked to find the concentration of an unknown hydrochloric acid using a sodium hydroxide solution of known concentration. Which sequence of steps is correct?
- A. Titrate to find the mean titre, calculate moles of NaOH used, use the mole ratio to find moles of HCl, then calculate concentration of HCl using c = n ÷ V
- B. Measure the mass of the acid, then calculate its Mr
- C. Add indicator to the acid only, then measure its pH directly
- D. Assume the concentrations of acid and alkali are always equal