Quiz 2.1 Acid-Base Definitions 1. The conjugate base of H 3O + is: A. H 3O B. H 2O C. H 3O D. H 3O + E. HO 2. What is the conjugate acid of C 6H 5NH 2? A. C 6H 5NH 3 + B. C 6H 5NH C. C 6H 5NH 4 + D. C 6H 5NH 2 3. Which of the following is NOT a conjugate acid-base pair? A. H 2O, H 3O + B. Cl, HCl C. SO 4 2, HSO 4 D. NO 3, HNO 3 E. OH, O 2 4. Identify each substance in the following reactions as an acid, a base, a conjugate base, or a conjugate acid. NH 3 (aq) + HF (aq) F (aq) + NH 4 + (aq) NaOH (aq) + H 2 O (l) NaOH (aq) + H 2 O (l) KOH (aq) + H 2 CO 3 (aq) KHCO 3 (aq) + H 2 O (l) C 2 H 3 O 2 H (aq) + NaHCO 3 (aq) NaC 2 H 3 O 2 (aq) + H 2 CO 3 (aq) DAT Bootcamp 1 of 12 Page
Quiz 2.2 Conjugate Base-Acid Relationship and ph Scale 1. Which of the following is the weakest acid? A. H 2S (K A = 1.1 10-7 ) B. HCO 2H (K A = 1.8 10-4 ) C. HF (K A = 6.8 10-4 ) D. NH 4 + (K A = 5.6 10-10 ) E. Acetic acid (K A = 1.8 10-5 ) 2. Which of the following molecules would be the strongest acid? OH OH O 3. Which of the following molecules would be the strongest acid? 4. Of the acids shown in the table below, is the strongest acid. A. C 2H 3OH B. H 2C 2O 4 C. HClO 2 D. HCO 2H E. H 2C 6H 6O 6 Continue to next page DAT Bootcamp 2 of 12 Page
Quiz 2.2 Conjugate Base-Acid Relationship and ph Scale (Continued) 5. Given the K A values in the table, which of the conjugate bases below is the strongest base? A. C 2H 3O B. HC 2O 4 C. ClO 2 D. HCO 2 E. HC 6H 6O 6 6. If H 2O has a pk A of 15.7 and acetic acid has a pk A of 4.75, which is a stronger base, hydroxide (OH ) or acetate (C 2H 3O 2 )? 7. Given the K B values in the table, which of the conjugate acids below is the weakest acid? A. HCO 2 B. C 5H 5NH + C. NH 4 + D. H 3NOH + E. H 2S DAT Bootcamp 3 of 12 Page
Quiz 2.3 Ranking Acids and Bases with CARDIO (Charge) 1. Which of the red-colored H atoms below would be the most acidic? 2. Which of the red-colored H atoms below would be the most acidic? 3. Which of the red-colored H atoms below would be the most acidic? 4. Which of the red-colored H atoms below would be the most acidic? Which would be the least? DAT Bootcamp 4 of 12 Page
Quiz 2.4 Ranking Acids and Bases with CARDIO (Atom) 1. Which of the following is the strongest acid? A. SeH 2 B. GeH 4 C. HBr D. AsH 3 2. Which of the following would be the strongest acid? Which would be the weakest? A. H 2Se B. H 2O C. H 2Te D. H 2S 3. Which of the following is the strongest acid? Which is the weakest? A. HF B. HBr C. H 2O D. H 2Se 4. Which of the following is the weakest acid? A. HCl B. H 2O C. H 3N D. H 2Se 5. Which of the following is the most acidic? A. H 2O B. CH 4 C. H 2S D. H 2Se 6. Which of the following is the most basic? A. H 3C B. CH 4 C. NH 3 D. OH DAT Bootcamp 5 of 12 Page
Quiz 2.5 Ranking Acids and Bases with CARDIO (Resonance) 1. Which of the following molecules is most acidic? Why? 2. Which of the red-colored hydrogen atoms in the molecules below is most acidic? Why? 3. Which of the labeled hydrogen atoms in the following structure is the most acidic? 4. Which of the labeled hydrogen atoms in the following structure is the most acidic? Continue to next page DAT Bootcamp 6 of 12 Page
Quiz 2.5 Ranking Acids and Bases with CARDIO (Resonance) (Continued) 5. Which of the labeled hydrogen atoms in the following structure is the most acidic? 6. The pk A of acetone is about 20. The pk A of propane is about 50. Why? 7. Which of the red-colored alpha-hydrogen atoms is the LEAST acidic? 8. Sort the compounds below in order of increasing acidity of their alpha-hydrogen atoms (colored red), from LEAST to MOST acidic: DAT Bootcamp 7 of 12 Page
Quiz 2.6 Ranking Acids and Bases with CARDIO (Dipole Induction) 1. Sort the following molecules from least to most acidic. 2. Sort the following molecules from least to most acidic. 3. Which of the following will be least acidic? Which will be the most acidic? Continue to next page DAT Bootcamp 8 of 12 Page
Quiz 2.6 Ranking Acids and Bases with CARDIO (Dipole Induction) (Continued) 4. Which of the following pairs does NOT correctly describe their relative acidities? 5. Sort the following molecules from least to most basic. 6. Which of the following would be a stronger base? Why? 7. Sort the following molecules from least to most basic. 8. Sort the following molecules from least to most nucleophilic. DAT Bootcamp 9 of 12 Page
Quiz 2.7 Ranking Acids and Bases with CARDIO (Orbitals) 1. Which of the red-colored hydrogen atoms below is most acidic? 2. Which of the red-colored hydrogen atoms below is most acidic? Which is the least? 3. Which of the red-colored hydrogen atoms below is most acidic? 4. Which of the red-colored hydrogen atoms below is most acidic? DAT Bootcamp 10 of 12 Page
Quiz 2.8 Acid and Base Review 1. Which of the options below is the conjugate acid of Molecule A? 2. Which of the following compounds is most acidic? Continue to next page DAT Bootcamp 11 of 12 Page
Quiz 2.8 Acid and Base Review (Continued) 3. Which of the indicated hydrogen atoms is most acidic? 4. Which of the following compounds is most acidic? DAT Bootcamp 12 of 12 Page