Test for Carbonates Quiz
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5 questions, one answer each
Each answer is checked as you go, with why.
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1. What do carbonates react with to release carbon dioxide gas?
- A. Water
- B. Dilute acid
- C. Sodium hydroxide
- D. Barium chloride
2. What happens to limewater when carbon dioxide is bubbled through it?
- A. It turns blue
- B. It turns cloudy white
- C. It turns bright yellow
- D. It stays completely clear
3. A student adds dilute acid to an unknown white solid and observes bubbling. Is this alone enough to confirm the solid contains a carbonate?
- A. Yes, bubbling always means carbon dioxide is being produced
- B. No, the gas must also be shown to turn limewater cloudy white
- C. No, bubbling proves the solid is definitely not a carbonate
- D. Yes, but only if the solid is also coloured
4. What substance causes limewater to turn cloudy white in the carbon dioxide test?
- A. A precipitate of calcium carbonate forming in the solution
- B. Dissolved carbon dioxide gas simply changing the solution's colour
- C. A reaction between limewater and the original acid
- D. Excess unreacted carbonate solid
5. A sample reacts with dilute acid producing a gas, but the gas does NOT turn limewater cloudy. What is the best conclusion?
- A. The sample definitely contains a carbonate
- B. The gas produced is unlikely to be carbon dioxide, so a carbonate is not confirmed
- C. The dilute acid used was faulty
- D. Limewater cannot be used to test unknown gases