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Basic Chemistry Practice Test: Acid-Base Equilibria
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Basic Chemistry Practice Test: Acid-Base Equilibria
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25 Questions

1. Which one of the following statements regarding Kw is false?
2. Classify the following compounds as weak acids (W) or strong acids (S):
nitrous acid hydrochloric acid hydrofluoric acid
3. What is the pH of an aqueous solution at 25.0 °C that contains 3.98 × 10-9 M hydronium ion?
4. The base-dissociation constant of ethylamine (C2H5NH2 ) is 6.4 × 10-4 at 25.0 °C. The of [H+ ] in a 1.6 × 10-2M solution of ethylamine is __________ M.
5. Calculate the pH of 0.726 M anilinium hydrochloride (C6H5NH3Cl) solution in water, given that Kb for aniline is 3.83 × 10-4 .
6. Kb for NH3 is 1.8 × 10-5 . What is the pH of a 0.35 M aqueous solution of NH4Cl at 25.0 °C?
7. What is the conjugate acid of NH3 ?
8. Of the following acids, __________ is not a strong acid.
9. In which of the following aqueous solutions does the weak acid exhibit the highest percentage ionization?
10. A substance that is capable of acting as both an acid and as a base is __________.
11. The molar concentration of hydroxide ion in pure water at 25°C is __________.
12. Calculate the pOH of a 0.0827 M aqueous sodium cyanide solution at 25.0 °C. Kb for CN- is 4.9 × 10-10 .
13. What is the pOH of a 0.0150 M solution of barium hydroxide?
14. Ammonia is a __________.
15. According to the Arrhenius concept, an acid is a substance that __________.
16. An aqueous solution of __________ will produce a basic solution.
17. Calculate the pOH of a solution at 25.0 °C that contains 1.94 × 10-10 M hydronium ions.
18. The Ka of hydrofluoric acid (HF) at 25.0 °C is 6.8 × 10-4 . What is the pH of a 0.35 M aqueous solution of HF?
19. What is the pH of an aqueous solution at 25.0 °C in which [OH- ] is 0.00250 M?
20. The concentration of water in pure water is approximately __________ M.
21. Determine the pH of a 0.15 M aqueous solution of KF. For hydrofluoric acid, -4 Ka = 7.0 × 10 .
22. The Ka of hypochlorous acid (HClO) is 3.0 × 10-8 at 25.0°C. What is the % ionization of hypochlorous acid in a 0.015-M aqueous solution of HClO at 25.0°C?
23. Ka for HX is 7.5 × 10-12 . What is the pH of a 0.15 M aqueous solution of NaX?
24. The Ka for formic acid (HCO2H) is 1.8 × 10-4 . What is the pH of a 0.35 M aqueous solution of sodium formate (NaHCO2 ) ?
25. Which one of the following is the weakest acid?

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