FAU CHM 1046 - Problem Set 8 – Chapter 17

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Problem Set 8 – Chapter 17 1. Which of the following is not a strong acid?a) HNO3c) HCℓO4e) H2SO4b) HF d) HCℓ2. Which of the following is not amphiprotic?a) H2O c) NH4+e) all choicesb) HSO4 –d) H2PO4–are amphiprotic3. Which of the following is not a Bronsted-Lowry acid?a) H2O c) Fe(H2O)63+b) HCO3–d) NH4 + e) all choices are Bronsted-Lowry acids.4. The ion HPO4–2 has both a conjugate base as well as a conjugate acid. The conjugate base of this ion is (1) while the conjugate acid is (2).a) (1) = H2PO4–(2) H3PO4b) (1) = PO4–(2) H2PO4+c) (1) = PO4–3(2) H2PO4–d) (1) = HPO5–3(2) HPO3–e) (1) = H2PO4–(2) PO4–35. The approximate pH of a 3.0 x 10-3 M solution of the strong acid H2SO4 isa) 3.5b) 3.0 c) 2.5d) 2.2 e) -3.06. Which statement below is correct (true)?a) Since HNO2 is a stronger acid than HF it must have a greater pKa.b) Since HOCℓ is a stronger acid than HCN, then OCℓ– is a stronger base than CN–.c) The dissociation (or ionization) of HOCℓ in water is HOCℓ + H2O  HCℓ + 2OH–.d) The pH of a 0.10 M solution of acetic acid (Ka = 1.8 x 10-5) will be higher than the pH of a 0.10 M solution of formic acid (Ka = 1.8 x 10-4).e) If the Kb for CH3NH2 is 5.0 x 10-4, the Ka for CH3NH3+ is 2.0 x 10-5.7. Which salt below will dissolve in water to yield an acidic solution?a) NaNO2b) K CℓO4c) NH4NO3d) Na2CO3e) Mg Br28. The Ka for HOBr is 2.4 x 10-9. Thus, you can report the pKb for OBr– asa) 4.2 x 10-6b) 9.62c) 5.38 d) 8.62 e) 1.389. If HClO2 is a stronger acid than HF, which is stronger than HOCl, then the order of strengths of the conjugate bases of these acids is ______ < _____ < _____a) ClO- < F- < ClO2- b) ClO2- < ClO- < F- e) F- < ClO2- < ClO- c) ClO- < ClO2- < F- d) ClO2- < F- < ClO-10. Look at problem #36 on page 798 of the text. For the three equations presented, pickthe correct choice below:a) All have equilibria that lie predominantly to the right.b) All have equilibria that lie predominantly to the left.c) Two of the three have equilibria that lie predominantly to the left.These are (a) and (b) in the problem.d) Two of the three have equilibria that lie predominantly to the left.These are (b) and (c) in the problem.e) Two of the three have equilibria that lie predominantly to the left.These are (a) and (c) in the problem.ANSWERS TO SET 8!!!1.B 2.C 3.E 4.C 5.D 6.D 7.C 8.C 9.D 10.DProblem Set 9 – Chapter 17 1. The Ka for acetic acid is 1.8 x 10-5. What is the pH of a 3.18 M solution of this acid?a) 2.12b) 4.74 c) 1.50 d) 4.24 e) 2.622. At 25oC, the pH of a 1.75 M NaCN solution (the Ka for HCN = 4.0 x 10-10) isa) 11.82b) 9.64 c) 4.58 d) 2.18 e) 9.423. A 0.0170 M solution of an acid has a pH = 2.5. What is the pKa of this acid? a) 3.54b) 1.77c) 3.23d) 3.14e) 3.304. Which 0.10M solution below has the lowest pH?a) NaCl b) KCN c) LiF d) RbClO e) all have the same pH"5. What is the equilibrium constant for the reaction of ammonium ion with formate ion? a) 1.0 X 10-13 b) 5.6 X 10-11c) 3.1 X 10-6d) 1.8 X 10-5 e) 3.2 X 1056. What is the pH of a solution which results from mixing 150 mL of 0.50M acetic acid and 150 mL of 0.50M sodium hydroxide at 25oC?a) 2.67 b) 9.07 c) 4.93 d) 8.26 e) 7.007. Which theory and definition of an acid matches?a) Arrhenius – acids are catalysts in reactions.b) Bronsted-Lowry – acids are proton scavengers.c) Lewis – acids donate electrons pairsd) All the above (a-c) are correct definitions.e) All the above (a-c) are incorrect definitions.8. Which solution has the greatest percent ionization?a) 1.0M HF b) 0.10M HNO2 c) 0.25M HOCld) 0.010 M copper(II) e) 0.20M ammonium ion9. Which of the following equations correspond to the Ka2 for phosphoric acid? note: the double equal sign (==) means equilibrium.a) HPO42- (aq) + H2O (l) == H3O+(aq) + PO43-(aq) b) PO43- (aq) + H2O (l) == HPO42-(aq) + OH–(aq) c) H3PO4 (aq) + H2O (l) == H3O+(aq) + H2PO4-(aq) d) H3PO4 (aq) + 2 H2O (l) == 2 H3O+(aq) + HPO42-(aq) e) H2PO4- (aq) + H2O (l) == H3O+(aq) + HPO42-(aq) 10. What is the pH of 1.0M Na2SO3 (aq) solution at 25C?a) 3.40b) 6.03c) 10.60d) 7.96e) 10.40ANSWERS TO SET 9!!!1.A 2.A 3.D 4.A 5.C 6.B 7.E 8.B 9.E


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FAU CHM 1046 - Problem Set 8 – Chapter 17

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