10 minutes maximum

An IB Periodic Table is required.
1. The pH of a 0.024 mol dm-3 hydrochloric acid is:
  • A.   0.6
  • B.   1.6
  • C.   2.4
  • D.   3.2
2. The pH of a solution of 0.5 mol dm-3 barium hydroxide at a temperature of 298K is:
  • A.   0
  • B.   0.3
  • C.   13.7
  • D.   14.0
3. 10 cm3 of a pH 0.7 hydrochloric acid is diluted with distilled water, to a total volume of 1.0 dm3. What is the pH of the diluted acid?
  • A.   -1.3
  • B.   0.7
  • C.   1.7
  • D.   2.7
4. What is the concentration of H+(aq) ions in a nitric acid solution of pH 2.5?
  • A.   0.0032 mol dm-3
  • B.   0.032 mol dm-3
  • C.   0.32 mol dm-3
  • D.   2.5 mol dm-3
5. A solution of sulphuric acid has a pH = 2. What is the approximate pH of the solution when the acid is diluted 106 times?
  • A.   2
  • B.   5
  • C.   7
  • D.   8
6. At 50 oC, the ionic product constant of water Kw = 5.43 x 10-14. What is the pH of water at this temperature?
  • A.   7.0
  • B.   6.6
  • C.   5.5
  • D.   4.2

7. Which of the following solutions is acidic at 298 K?

I.     [H+(aq)] = 3 x 10-4 mol dm-3
II.     [OH-(aq)] = 5.5 x 10-9 mol dm-3
III.     A solution with pH = 9.7
 
  • A.   I and II only
  • B.   II and III only
  • C.   I only
  • D.   I, II and III
8. Which of the following statements about acids is true?
  • A.   An acid always has a pH of greater than 7.
  • B.   Acid reacts with an alkali to make a salt and hydrogen.
  • C.   Brønsted -Lowry acids are proton donors.
  • D.   pH of a strong acid solution will decrease by 1 if the acid is diluted 10 times in volume.

9. 25 cm3 of 1.0 mol dm-3 hydrochloric acid is added to 25 cm3 of 0.4 mol dm-3 potassium hydroxide. What is the pH of the resulting solution?

  • A. 
 $$ - log \big( {{25 \times 1.0 + 25 \times 0.4} \over{50}}\big)$$
  • B. 
 $$ - log \big( {{25 \times 1.0} \over{50}}\big)$$
  • C. 
 $$ - log \big( {{25 \times 0.4} \over{50}}\big)$$
  • D. 
$$ - log \big( {{25 \times 1.0 - 25 \times 0.4} \over{50}}\big)$$
10. 30 cm3 of 1 mol dm-3 sodium hydroxide is added into 20 cm3 of 0.5 mol dm-3 hydrochloric acid.

NaOH + HCl   → NaCl + H2O

What is the pH of the resultant solution?

  
  • A.   14.4
  • B.   13.6
  • C.   7.0
  • D.   0.4