Sulfate Ions Quiz
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5 questions, one answer each
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1. What reagent is used to test for sulfate ions?
- A. Silver nitrate solution
- B. Barium chloride solution
- C. Sodium hydroxide solution
- D. Limewater
2. What is the positive result of the sulfate ion test?
- A. A yellow precipitate
- B. A blue precipitate
- C. A white precipitate
- D. The solution turns cloudy blue
3. Why is dilute hydrochloric acid added to the sample before the barium chloride?
- A. To speed up the reaction
- B. To remove carbonate ions, which would otherwise also give a false positive white precipitate
- C. To make the precipitate more soluble
- D. To change the colour of the sulfate precipitate
4. A student skips the dilute hydrochloric acid step and sees a white precipitate after adding barium chloride to an unknown solution. Why can they not be certain sulfate ions are present?
- A. Barium chloride never gives a precipitate
- B. The white precipitate could instead be from carbonate ions reacting with the barium ions
- C. White precipitates are always from chloride ions
- D. The test only works with coloured solutions
5. Which pair of reagent and result correctly matches the sulfate ion test?
- A. Silver nitrate with dilute nitric acid, cream precipitate
- B. Barium chloride with dilute hydrochloric acid, white precipitate
- C. Sodium hydroxide, blue precipitate
- D. Barium chloride with dilute nitric acid, yellow precipitate