Slide 1 / 48 Slide 2 / 48 1 According to the Arrhenius concept, an - - PDF document

Slide 1 / 48

1 According to the Arrhenius concept, an acid is a substance that __________. A is capable of donating one or more H+ B causes an increase in the concentration of H+ in aqueous solutions C can accept a pair of electrons to form a coordinate covalent bond D reacts with the solvent to form the cation formed by autoionization of that solvent E tastes bitter

Slide 2 / 48

2 A Bronsted-Lowry base is defined as a substance that __________. A increases [H+] when placed in H2O B decreases [H+] when placed in H2O C increases [OH-] when placed in H2O D acts as a proton acceptor E acts as a proton donor

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3 A Bronsted-Lowry acid is defined as a substance that __________. A increases Ka when placed in H2O B decreases [H+] when placed in H2O C increases [OH-] when placed in H2O D acts as a proton acceptor E acts as a proton donor

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4 A substance that is capable of acting as both an acid and as a base is __________. A autosomal B conjugated C amphoteric D saturated E miscible

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5 What is the conjugate acid of NH3? A NH3 B NH2

+

C NH3

+

D NH4

+

E NH4OH

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6 The conjugate base of HSO4 - is __________. A OH- B H2SO4 C SO4

2-

D HSO4

+

E H3SO4

+

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7 The conjugate acid of HSO4 - is __________. A H+ B H2SO4 C SO4 2- D HSO4

+

E HSO3

+

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8 What is the conjugate base of OH-? A O2 B O- C H2O D O2- E H3O+

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9 Which one of the following is a Bronsted-Lowry acid? A (CH3)3NH+ B CH3COOH C HF D HNO2 E all of the above

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10 Which of the following compounds could never act as an acid? A SO4

2-

B HSO4 - C H2SO4 D NH3 E CH3COOH

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11 What is an acid, according to Bronsted-Lowry? A anything that donates hydrogen atoms B anything that donates hydrogen ions C anything that accepts hydrogen ions D anything that dissolves metal E anything that donates hydronium ions

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12 What is a base, according to Bronsted-Lowry? A anything that accepts hydrogen ions B anything that accepts hydroxide ions C anything that donates hydroxide ions D anything that can be used to clean drains E anything with a bitter taste

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13 According to the following reaction, which molecule is acting as an acid? H2O + H2SO4 → H3O+ + HSO4

• A

H2SO4 B H2O C H3O+ D HSO4

• E

None of the above

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14 According to the following reaction, which molecule is acting as base? H2O + H2SO4 → H3O+ + HSO4

• A

H2SO4 B H2O C H3O+ D HSO4

• E

None of the above

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15 According to the following reaction, which molecule is acting as an acid? H3O+ + HSO4

• → H2O + H2SO4

A H2SO4 B H2O C H3O+ D HSO4

• E

None of the above

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16 According to the following reaction, which molecule is acting as a base? H3O+ + HSO4

• → H2O + H2SO4

A H2SO4 B H20 C H3O+ D HSO4

• E

None of the above

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17 According to the following reaction, which molecule is acting as a base? H2O + NH3 → OH- + NH4

+

A H2O B NH3 C OH- D NH4

+

E None of the above

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18 According to the following reaction, which molecule is acting as an acid? H2O + NH3 → OH- + NH4

+

A H2O B NH3 C OH- D NH4

+

E None of the above

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19 According to the following reaction, which molecule is acting as an acid? OH- + NH4

+ → H2O + NH3

A H2O B NH3 C OH- D NH4

+

E None of the above

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20 According to the following reaction, which molecule is acting as a base? OH- + NH4

+ → H2O + NH3

A H2O B NH3 C OH- D NH4

+

E None of the above

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21 In the below reaction, what does the double arrow symbol “↔” mean? OH- + NH4

+ ↔ H2O + NH3

A The forward and backwards reactions are happening at the same time B The reaction can’t decide which way to go C The forward reaction does not progress D The backward reaction happens as fast as the forward reaction so the proton is not transferred E None of the above

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22 For the following reaction, identify whether the compound in bold is behaving as an acid or a base. H3PO4 + H2O <--> H2PO4

• + H3O+

A Acid B Base C Neither D Both E None of the above

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23 For the following reaction, identify whether the compound in bold is behaving as an acid or a base. H3PO4 + H2O <--> H2PO4

• + H3O+

A Acid B Base C Neither D Both E None of the above

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24 For the following reaction, identify whether the compound in bold is behaving as an acid or a base. H3PO4 + H2O ↔ H2PO4

• + H3O+

A Acid B Base C Neither D Both E None of the above

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25 For the following reaction, identify whether the compound in bold is behaving as an acid or a base. H3PO4 + H2O ↔ H2PO4

• + H3O+

A Acid B Base C Neither D Both E None of the above

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26 A substance that is capable of acting as both an acid and as a base is __________. A autosomal B conjugated C amphoteric D saturated E miscible

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27 The molar concentration of hydronium ion in pure water at 25 °C is __________. A 0.00 B 1.0x10-7 C 1.0x10-14 D 1.00 E 7.00

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28 The molar concentration of hydroxide ion in pure water at 25 °C is __________. A 1.00 B 0.00 C 1.0x10-14 D 1.0x10-7 E 7.00

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29 The magnitude of Kw indicates that __________. A water autoionizes very slowly B water autoionizes very quickly C water autoionizes only to a very small extent D the autoionization of water is exothermic

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30 In basic solution, __________. A [H3O+] = [OH-] B H3O+] > [OH-] C [H3O+] < [OH-] D [H3O+] = 0M E [OH-] >7.0

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31 An aqueous solution contains 0.10 M NaOH. The solution is __________. A very dilute B highly colored C basic D neutral E acidic

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32 Nitric acid is a strong acid. This means that __________. A aqueous solutions of HNO3 contain equal concentrations of H+ (aq) and OH- (aq) B HNO3 does not dissociate at all when it is dissolved in water C HNO3 dissociates completely to H+ (aq) and NO3

• (aq) when it dissolves in water

D HNO3 produces a gaseous product when it is neutralized E HNO3 cannot be neutralized by a weak base

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33 Which of the following solutions is the most acidic? A a solution with pH = 3 B a solution with pH = 5 C a solution with pH = 7 D a solution with pH = 10 E all of the solutions are basic

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34 If you had a 1.0 M solution of a strong acid, what would be a reasonable pH? A 1 B 6 C 7 D 8 E 13

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35 If you had a 1.0 M solution of a weak acid, what would be a reasonable pH? A 1 B 6 C 7 D 8 E 13

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36 If you had a 1.0 M solution of a weak base, what would be a reasonable pH? A 1 B 6 C 7 D 8 E 13

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37 If you had a 1.0 M solution of a strong base, what would be a reasonable pH? A 1 B 6 C 7 D 8 E 13

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38 Which solution below has the highest concentration of hydroxide ions? A pH = 3.21 B pH = 12.6 C pH = 7.93 D pH = 9.82 E pH = 7.00

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39 As the pH increases, the hydroxide ion concentration __________. A decreases B increases C starts to affect the [H+] D stays constant

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40 If the pH of a solution is 10, what is the hydronium ion concentration? A 4 B 10 C 1 x 10-4 D 1 x 10-7 E 1 x 10-10

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41 If the pH of a solution was 7 and you were to increase the hydroxide ion concentration, what would the pH be? A 1 B 5 C 7 D 9 E 1 x 10-5

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42 If the pH of a solution was 7 and you were to increase the hydronium ion concentration 1000x, what would the pH be? A 4 B 7 C 143 D 7000 E 1 x 10-4

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43 An aqueous solution at 25.0 °C contains [H+] = 0.099M. What is the pH of the solution? A 1.00 B

• 1.00

C 13.0 D 0.0990 E 1.00x10-13

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44 The pH of an aqueous solution at 25.0 °C is 10.66. What is the molarity of in this solution? A 2.2x10-11 B 4.6 x10-4 C 3.3 D 1.1x10-13 E 4.6x1010

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45 What is the pH of an aqueous solution at 25.0 °C in which [H]+ is 0.0025 M? A 3.40 B 2.60 C

• 2.60

D

• 3.40

E 2.25

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46 What is the pH of an aqueous solution at 25.0 °C that contains 3.98x10-9 M hydronium ion? A 8.400 B 5.600 C 9.000 D 3.980 E 7.000

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47 What is the concentration (in M) of hydronium ions in a solution at 25.0 °C with pH = 4.282? A 4.28 B 9.71 C 1.92x10-10 D 5.22x10-5 E 1.66x104

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