Concentration of an Unknown Acid Quiz
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5 questions, one answer each
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1. Which piece of apparatus is used to add acid a small amount at a time during a titration?
- A. Pipette
- B. Burette
- C. Conical flask
- D. Measuring cylinder
2. Which of these acids can be used in the required practical titration?
- A. Ethanoic acid
- B. Carbonic acid
- C. Hydrochloric acid
- D. Citric acid
3. What is the end point of a titration?
- A. The moment the burette runs out of acid
- B. The point at which the indicator just changes colour, showing the reaction is complete
- C. The point at which the flask is filled to the top
- D. The moment the experiment is repeated
4. Why should a titration be repeated until concordant results are obtained?
- A. To use up more chemicals
- B. To obtain reliable data by identifying and excluding anomalous results
- C. Because the first titration is always wrong
- D. To change the concentration of the alkali
5. In a titration, 20.0 cm3 of 0.200 mol/dm3 sodium hydroxide exactly neutralises 25.0 cm3 of hydrochloric acid (1:1 mole ratio). What is the concentration of the hydrochloric acid?
- A. 0.100 mol/dm3
- B. 0.160 mol/dm3
- C. 0.200 mol/dm3
- D. 0.250 mol/dm3