MCAT General Chemistry Practice Test 10: Acids and Bases

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1. Which of the following is not a Bronsted–Lowry base?

  • A.
  • B. F-
  • C.
  • D. H — O — N = O

2. Which of the following is closest to the pH of a solution containing 5 mM H2SO4?

  • A. 1
  • B. 2
  • C. 3
  • D. 4

3. Which of the following represents chloric acid?

  • A. HClO3
  • B. ClO3?
  • C. HClO2
  • D. HClO

4. Which of the following bases is the weakest?

  • A. KOH
  • B. NH3
  • C. CH3NH2
  • D. Ca(OH)2

5. The function of a buffer is to:

  • A. maintain a neutral pH.
  • B. resist changes in pH when small amounts of acid or base are added.
  • C. slow down reactions between acids and bases.
  • D. speed up reactions between acids and bases.

6. What is the pH of a solution with an ammonium concentration of 70 mM and an ammonia concentration of 712 mM? (Note: The pKb of ammonia is 3.45.)

  • A. 2.45
  • B. 4.45
  • C. 9.55
  • D. 11.55

7. Question below refer to the titration curve of acid X shown below:

What is the approximate value of pKa1?

  • A. 1.9
  • B. 2.9
  • C. 3.8
  • D. 4.1

8. Question below refer to the titration curve of acid X shown below:

At what pH is the second equivalence point?

  • A. pH = 3.0
  • B. pH = 4.1
  • C. pH = 5.9
  • D. pH = 7.2

9. Question below refer to the titration curve of acid X shown below:

What is the approximate value of pKa2?

  • A. 3.6
  • B. 4.1
  • C. 5.5
  • D. 7.2

10. What is the gram equivalent weight of phosphoric acid?

  • A. 24.5 g
  • B. 32.7 g
  • C. 49.0 g
  • D. 98.0 g

11. What is the [H3O+] of a 2 M aqueous solution of a weak acid HXO2 with Ka = 3.2 × 10?5?

  • A. 6.4 × 10?5 M
  • B. 1.3 × 10?4 M
  • C. 4.0 × 10?3 M
  • D. 8.0 × 10?3 M

12. A solution is prepared with an unknown concentration of a theoretical compound with a Ka of exactly 1.0. What is the pH of this solution?

  • A. Higher than 7
  • B. Exactly 7
  • C. Less than 7
  • D. There is not enough information to answer the question.

13. Which of the following is NOT a characteristic of an amphoteric species?

  • A. Amphoteric species can act as an acid or a base, depending on its environment.
  • B. Amphoteric species can act as an oxidizing or reducing agent, depending on its environment.
  • C. Amphoteric species are sometimes amphiprotic.
  • D. Amphoteric species are always nonpolar.

14. What is the approximate pH of a 1.2 × 10?5 M aqueous solution of NaOH?

  • A. 4.92
  • B. 7.50
  • C. 9.08
  • D. 12.45

15. How many liters of 2 M Ba(OH)2 are needed to titrate a 4 L solution of 6 M H3PO4?

  • A. 1.33 L
  • B. 12 L
  • C. 18 L
  • D. 56 L