Qualitative Analysis: Tests for Ions 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 flame colour indicates the presence of sodium ions?
- A. Red
- B. Yellow
- C. Lilac
- D. Blue-green
2. What is used to test for sulfate ions in solution?
- A. Sodium hydroxide solution
- B. Dilute nitric acid then silver nitrate solution
- C. Dilute hydrochloric acid then barium chloride solution
- D. Limewater
3. A student adds sodium hydroxide to an unknown solution and gets a white precipitate. They then add excess sodium hydroxide and the precipitate dissolves. Which ion is present?
- A. Calcium
- B. Copper
- C. Aluminium
- D. Iron(III)
4. Why must dilute nitric acid be added before silver nitrate solution when testing for halide ions?
- A. To make the solution more concentrated
- B. To remove carbonate ions, which would otherwise give a false-positive precipitate
- C. To change the colour of the final precipitate
- D. To speed up the reaction with silver ions
5. A student is given an unknown salt. Adding sodium hydroxide produces a green precipitate, and adding dilute hydrochloric acid then barium chloride produces a white precipitate. What is the likely identity of the salt?
- A. Copper sulfate
- B. Iron(II) sulfate
- C. Iron(III) chloride
- D. Calcium carbonate