Practice Test: Acids and Bases / Answer using a #2pencil
Version A / Bubble the correct answer on the scantron.
1.Which of the following solutions will be the most acidic?
A. lemon juice pH = 2B. acid rain pH = 5
C. stomach fluid pH = 1D. drain cleaner pH = 13
2. ______ions are associated with bases just as ______ions are associated with acids.
A. Hydroxide, hydroxideB. Hydroxide; hydronium
C. Hydronium, hydroniumD. Hydronium, hydroxide
3.Lemons taste very sour. This taste is a property of a(n) ______.
A. acidB. base
C. neutral substanceD. unknown substance
4.A solution with a pH of 6.5 would be classified as a(an) ______.
A. Neutral solutionB. Acid
C. BaseD. Not enough information
5. Drano, a drain cleaner, will turn red litmus paper blue, it turns bright pink with phenolphthalein, and feels slippery if it gets on your skin. Drano has a pH ______.
A. below 7B. above 7
C. of 7D. that cannot be determined without testing
6. A(n) ______is a proton donor.
A. baseB. acid
C. saltD. solution
7. Which of the following compounds would be classified as an acid?
A. NaClB. H2SO4
C. CaCO3 D. NaOH
8.The purpose of a buffer solution is to:
A. maintain an acidic pHB. maintain a stable pH
C. maintain a basic pHD. none of these
9. The reaction between sodium hydroxide and hydrochloric acid yielding salt and water illustrates what specific chemical reaction?
A. single displacementB. combustion
C. neutralizationD. polymerization
10. Acid rain _____ the pH of lakes.
A. lowersB. raises
C. maintainsD. neutralizes
11. Bases are substances which usually include the ______ion in their structures.
A. chlorineB. hydrogen
C. oxygenD. hydroxide
12. ______is a chemical reaction between an acid and a base.
A. SolubilityB. Saturation
C. NeutralizationD. Aeration
13. Predict the products of the following neutralization reaction. HCl + NaOH ----> ____ + ____
A. Na2O; H2ClB. HNa; ClOH
C. NaCl; H2OD. HNaO; Cl 2
14. When you test a substance with a pH meter, it has a reading of 3.4. This substance would most likely be ______.
A. a baseB. an acid
C. a saltD. neutral
15.125mL of 3M HNO3 is needed to clean up a spill of .2L of NaOH. What is the molarity of the base?
A. 1.875MB. 0.1875
C. 1875MD. ionic
16.According to Arrhenius, a(n) ______is an OH - donor.
A. baseB. acid
C. saltD. solution
17. Acids are substances that have one or more ______ions that can be released rather easily.
A. hydrogenB. chlorine
C. hydroxideD. oxygen
18. Blue litmus paper turns red when a ______substance is tested.
A. basicB. acidic
C. neutralD. buffered
19. How much 2.5M HCl is needed to neutralize 200mL of 1.5M NaOH?
A. 333mLB. 120mL
C. 333LD. 120L
20.What is the pH of a 5M solution with a Ka= 1.6x10-8?
A. 7.79B. 3.54
C. 7.09D. 5.00
21. Sodium Hydroxide is classified as a(n) ______.
A. acidB. base
C. saltD. mineral
22. The two substances produced in a neutralization reaction are ______.
A. acid and baseB. sugar and water
C. water and saltD. salt and sugar
23. The active ingredient in milk of magnesia is magnesium hydroxide, Mg(OH)2 , which gives this product a pH ______.
A. below 7B. above 7
C. of 7D. that cannot be determined without testing
24. What is the pOH of a solution with a [H+] concentration of 1.4x10-3
A. 2.85B. 7
C. 11.15D. 14
25. A substance has the formula Ca(OH)2. This substance is a(n) ______.
A. acidB. base
C. neutral substanceD. organic compound
27.In the reaction below, identify the conjugate acid-base pair. (The acid is listed first in the pair.)
HSO4- + HCO3- ⇋ SO42- + H2CO3
Acid Conjugate Base
a) HSO4- HCO3-
b) HSO4- SO42-
c) HCO3- SO42-
d) HCO3- H2CO3
28. In which of the following pairs of acids are both chemical species of the pair polyprotic?
A. H2SO4 and HC2H3O2B. HNO3 and H2C4H4O6
C. HC2H3O2 and H3C6H5O7D. H3PO4 and H2C4H4O6
29. The neutralization of Al(OH)3 with HNO3 produces which of the following salts?
A. AlH3B. Al(NO3)3
C. HOHD. HONO3
30. Which of the following solutions is acidic?
A. [H3O+] = 1.00 x 10-5B. [H3O+] = 1.00 x 10-7
C. [H3O+] = 1.00 x 10-9D. [H3O+] = 1.00 x 10-14
31. A solution with [H3O+] = 1.00 x 10-5 would have [OH-] equal to
A.1.00 x 10-5B. 1.00 x 10-7
C. 1.00 x 10-9D. 1.00 x 10-14
32. The pH of a solution for which [H3O+] = 1.0 x 10-5 is
A. 1.00B. 5.00
C. 9.00D. -5.00
33. The pH of a solution for which [OH-] = 1.0 x 10-6 is
A.1.00B. 6.00
C.8.00D. -6.00
34. A solution with a pOH of 12.0 is
A. strongly acidic B. weakly acidic
C. weakly basic D. strongly basic
35. In a solution with a pH of 4.10 the molar concentration of the hydrogen ion would be
A. 4.1 x 10-4B. 8.6 x 10-4
C. 4.1 x 10-5 D. 7.9 x 10-5
PART II
- Determine the following with respect to HOCl.
- Write the complete ionization/dissociation equation.
- Ionization constant (Ka) expression for the given acid.
- Calculate the pH of 0.66 M HOCl solution if the ionization constant (Ka) for HOClis 2.8 x 10-8
- Lactic acid, HC3H5O3, is found in sour milk. What is the pH of 0.30 M lactic
acid?(Ka = 1.4 104)
===== ANSWER KEY =====
1. C
2. B
3. A
4. B
5. B
6. B
7. B
8. B
9. C
10. A
11. D
12. C
13. C
14. B
15. A
16. A
17. A
18. B
19. B
20. B
21. B
22. C
23. B
24. C
25. B
26. A
27. B
28. D
29. B
30. A
31. C
32. B
33. C
34. D
35. D