Acid-base titrations Quiz
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5 questions, one answer each
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1. What is the concentration, in mol dm⁻³, of 0.050 mol of solute in 250 cm³ of solution?
- A. 0.20
- B. 0.0125
- C. 5.0
- D. 0.050
2. Which is the colour of phenolphthalein in an alkaline solution?
- A. Colourless
- B. Yellow
- C. Red
- D. Pink
3. A burette reading has an uncertainty of ±0.05 cm³. What is the percentage uncertainty in a titre of 20.00 cm³, from two readings?
- A. 0.25%
- B. 0.10%
- C. 1.0%
- D. 0.50%
4. What mass of NaOH (M = 40.0 g mol⁻¹) is in 1 dm³ of a 0.0906 mol dm⁻³ solution?
- A. 0.0906 g
- B. 36.2 g
- C. 3.62 g
- D. 0.362 g
5. Why is the volumetric flask inverted after making up to the mark?
- A. To dissolve the solid
- B. To mix so the concentration is uniform
- C. To measure the volume
- D. To remove air bubbles from the burette