Slide 1 / 48 1 According to the Arrhenius concept, an acid is a - 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+ causes an increase in the concentration of H+ in B aqueous solutions can accept a pair of electrons to form a C coordinate covalent bond reacts with the solvent to form the cation D formed by autoionization of that solvent E tastes bitter Slide 2 / 48 2 A Bronsted-Lowry base is defined as a substance that __________. increases [H + ] when placed in H 2 O A decreases [H + ] when placed in H 2 O B increases [OH - ] when placed in H 2 O C D acts as a proton acceptor E acts as a proton donor Slide 3 / 48 3 A Bronsted-Lowry acid is defined as a substance that __________. A increases Ka when placed in H 2 O decreases [H + ] when placed in H 2 O B C increases [OH-] when placed in H 2 O D acts as a proton acceptor E acts as a proton donor

Slide 4 / 48 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 Slide 5 / 48 5 What is the conjugate acid of NH 3 ? A NH 3 + B NH 2 + C NH 3 + D NH 4 E NH 4 OH Slide 6 / 48 The conjugate base of HSO 4 - is __________. 6 OH - A B H 2 SO 4 2- C SO 4 + D HSO 4 + E H 3 SO 4

Slide 7 / 48 The conjugate acid of HSO 4 - is __________. 7 H + A H 2 SO 4 B SO 4 2- C + D HSO 4 + E HSO 3 Slide 8 / 48 8 What is the conjugate base of OH-? A O 2 B O- C H 2 O O 2- D H 3 O + E Slide 9 / 48 9 Which one of the following is a Bronsted-Lowry acid? (CH 3 ) 3 NH + A B CH 3 COOH C HF D HNO 2 E all of the above

Slide 10 / 48 10 Which of the following compounds could never act as an acid? 2- A SO 4 HSO 4 - B C H 2 SO 4 D NH 3 E CH 3 COOH Slide 11 / 48 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 Slide 12 / 48 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

Slide 13 / 48 13 According to the following reaction, which molecule is acting as an acid? H 2 O + H 2 SO 4 → H 3 O + + HSO 4 - A H 2 SO 4 B H 2 O H 3 O + C - D HSO 4 E None of the above Slide 14 / 48 14 According to the following reaction, which molecule is acting as base? - H 2 O + H 2 SO 4 → H 3 O+ + HSO 4 A H 2 SO 4 B H 2 O H 3 O + C - D HSO 4 E None of the above Slide 15 / 48 15 According to the following reaction, which molecule is acting as an acid? H 3 O + + HSO 4 - → H 2 O + H 2 SO 4 A H 2 SO 4 B H 2 O H 3 O + C - D HSO 4 E None of the above

Slide 16 / 48 16 According to the following reaction, which molecule is acting as a base? H 3 O + + HSO 4 - → H 2 O + H 2 SO 4 A H 2 SO 4 B H 2 0 H 3 O + C - D HSO 4 E None of the above Slide 17 / 48 17 According to the following reaction, which molecule is acting as a base? + H 2 O + NH 3 → OH- + NH 4 A H 2 O B NH 3 C OH- + D NH 4 E None of the above Slide 18 / 48 18 According to the following reaction, which molecule is acting as an acid? + H 2 O + NH 3 → OH- + NH 4 A H 2 O B NH 3 C OH- + D NH 4 E None of the above

Slide 19 / 48 19 According to the following reaction, which molecule is acting as an acid? OH - + NH 4 + → H 2 O + NH 3 A H 2 O B NH 3 OH - C + D NH 4 E None of the above Slide 20 / 48 20 According to the following reaction, which molecule is acting as a base? OH - + NH 4 + → H 2 O + NH 3 A H 2 O B NH 3 C OH- + D NH 4 E None of the above Slide 21 / 48 21 In the below reaction, what does the double arrow symbol “ ↔ ” mean? OH - + NH 4 + ↔ H 2 O + NH 3 The forward and backwards reactions are A happening at the same time B The reaction can’t decide which way to go C The forward reaction does not progress The backward reaction happens as fast as the D forward reaction so the proton is not transferred E None of the above

Slide 22 / 48 22 For the following reaction, identify whether the compound in bold is behaving as an acid or a base. - + H 3 O + H 3 PO 4 + H 2 O <--> H 2 PO 4 A Acid B Base C Neither D Both E None of the above Slide 23 / 48 23 For the following reaction, identify whether the compound in bold is behaving as an acid or a base. - + H 3 O + H 3 PO 4 + H 2 O <--> H 2 PO 4 A Acid B Base C Neither D Both E None of the above Slide 24 / 48 24 For the following reaction, identify whether the compound in bold is behaving as an acid or a base. - + H 3 O + H 3 PO 4 + H 2 O ↔ H 2 PO 4 A Acid B Base C Neither D Both E None of the above

Slide 25 / 48 25 For the following reaction, identify whether the compound in bold is behaving as an acid or a base. - + H 3 O + H 3 PO 4 + H 2 O ↔ H 2 PO 4 A Acid B Base C Neither D Both E None of the above Slide 26 / 48 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 Slide 27 / 48 27 The molar concentration of hydronium ion in pure water at 25 °C is __________. A 0.00 1.0x10 -7 B 1.0x10 -14 C D 1.00 E 7.00

Slide 28 / 48 28 The molar concentration of hydroxide ion in pure water at 25 °C is __________. A 1.00 B 0.00 1.0x10 -14 C 1.0x10 -7 D E 7.00 Slide 29 / 48 29 The magnitude of K w 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 Slide 30 / 48 30 In basic solution, __________. [H 3 O + ] = [OH - ] A H 3 O + ] > [OH - ] B [H 3 O + ] < [OH - ] C [H 3 O + ] = 0M D [OH - ] >7.0 E

Slide 31 / 48 31 An aqueous solution contains 0.10 M NaOH. The solution is __________. A very dilute B highly colored C basic D neutral E acidic Slide 32 / 48 32 Nitric acid is a strong acid. This means that __________. aqueous solutions of HNO 3 contain equal A concentrations of H+ (aq) and OH- (aq) HNO 3 does not dissociate at all when it is dissolved B in water - HNO 3 dissociates completely to H+ (aq) and NO 3 C (aq) when it dissolves in water HNO 3 produces a gaseous product when it is D neutralized E HNO 3 cannot be neutralized by a weak base Slide 33 / 48 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

Slide 34 / 48 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 Slide 35 / 48 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 Slide 36 / 48 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

Slide 37 / 48 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 Slide 38 / 48 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 Slide 39 / 48 39 As the pH increases, the hydroxide ion concentration __________. A decreases B increases C starts to affect the [H+] D stays constant

Slide 40 / 48 40 If the pH of a solution is 10, what is the hydronium ion concentration? A 4 B 10 1 x 10 -4 C 1 x 10 -7 D 1 x 10 -10 E Slide 41 / 48 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 1 x 10 -5 E Slide 42 / 48 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 1 x 10 -4 E

Slide 43 / 48 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 1.00x10 -13 E Slide 44 / 48 44 The pH of an aqueous solution at 25.0 °C is 10.66. What is the molarity of in this solution? 2.2x10 -11 A 4.6 x10 -4 B C 3.3 1.1x10 -13 D 4.6x10 10 E Slide 45 / 48 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

Slide 46 / 48 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 Slide 47 / 48 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 1.92x10 -10 C 5.22x10 -5 D 1.66x10 4 E Slide 48 / 48