Acids, Alkalis & Titrations 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 colour does litmus turn in an alkaline solution?
- A. Red
- B. Blue
- C. Yellow
- D. Colourless
2. Which pH range is classed as weakly acidic?
- A. 0-3
- B. 4-6
- C. 7
- D. 8-10
3. What species is responsible for a solution being alkaline?
- A. Hydrogen ions, H+
- B. Hydroxide ions, OH-
- C. Chloride ions, Cl-
- D. Oxygen molecules, O2
4. In a titration, why is the acid added slowly and dropwise as the end point approaches?
- A. To save time
- B. To ensure the exact volume needed for the colour change is measured accurately
- C. Because the burette cannot deliver acid quickly
- D. To cool the reaction mixture
5. A student titrates sodium hydroxide with hydrochloric acid using phenolphthalein indicator. What colour change signals the end point?
- A. Colourless to pink
- B. Pink to colourless
- C. Red to yellow
- D. Blue to red