MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
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1 Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Which one of the following is the weakest acid? 1) A) HF (Ka = ) B) HNO2 (Ka = ) C) HClO (Ka = ) D) Acetic acid (Ka = ) E) HCN (Ka = ) 2) The ph of a solution that contains M acetic acid (Ka = ) and M sodium acetate is. A) 8.37 B) 9.92 C) 5.43 D) 4.08 E) ) 3) What is the conjugate acid of NH3? 3) A) NH3 B) NH3 + C) NH2 + D) NH4OH E) NH4 + 4) A substance that is capable of acting as both an acid and as a base is. 4) A) saturated B) amphoteric C) autosomal D) miscible E) conjugated 5) Consider the following equilibrium. 5) 2 SO2 (g) + O2 (g) 2 SO3 (g) The equilibrium cannot be established when is/are placed in a 1.0-L container. A) 0.75 mol SO2 (g) B) 0.25 mol of SO2 (g) and 0.25 mol of SO3 (g) C) 0.25 mol SO2 (g) and 0.25 mol O2 (g) D) 1.0 mol SO3 (g) E) 0.50 mol O2 (g) and 0.50 mol SO3 (g) 6) Of the following solutions, which has the greatest buffering capacity? 6) A) M HF and M NaF B) M HF and M NaF C) M HF and M NaF D) M HF and M NaF E) They are all buffer solutions and would all have the same capacity. 1
2 ESSAY. Write your answer in the space provided or on a separate sheet of paper. 7) Consider 25.0 ml of M HA, for which Ka = 1.00 x 10-5, titrated with M NaOH solution. a. What is the initial ph of the acid, before adding any titrant? b. What is the ph after adding 10.0 ml of titrant? 2
3 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 8) The addition of hydrofluoric acid and to water produces a buffer solution. 8) A) NaF B) HCl C) NaNO3 D) NaCl E) NaBr 9) For the endothermic reaction 9) CaCO3 (s) CaO (s) + CO2 (g) ^ Le Chatelier's principle predicts that will result in an increase in the number of moles of CO2. A) increasing the temperature B) decreasing the temperature C) increasing the pressure D) removing some of the CaCO3 (s) E) none of the above 10) Which of the following aqueous solutions has the lowest [OH-]? 10) A) a M solution of HNO3 B) a M solution of NH4Cl C) a solution with a poh of 12.0 D) pure water E) a solution with a ph of 3.0 ESSAY. Write your answer in the space provided or on a separate sheet of paper. 11) A mixture of mol of NO and mol of H2 is placed in an evacuated 1.00 L vessel at 300 K. The following equilibrium is established: 2 NO(g) + 2 H2(g) N2(g) + 2 H2O(g) At equilibrium [N2] = M a. Calculate the equilibrium concentrations of NO, H2, and H2O. [Make an ICE table ] 3
4 b. Calculate Kc. c. In general, does an equilibrium mixture of NO, H2, N2, and H2O at 300 K favor products or reactants? 4
5 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 12) A Br nsted-lowry acid is defined as a substance that. 12) A) acts as a proton acceptor B) acts as a proton donor C) increases [OH-] when placed in H2O D) decreases [H+] when placed in H2O E) increases Ka when placed in H2O 13) The conjugate base of HSO4 - is. 13) A) SO4 2- B) H3SO4 + C) H2SO4 D) HSO4 + E) OH- 14) Of the following, is a weak acid. 14) A) HClO4 B) HF C) HNO3 D) HBr E) HCl 15) What is the ph of an aqueous solution at 25.0 C that contains M hydroxide ion? 15) A) 7.00 B) 5.60 C) 8.40 D) 3.98 E) ) Which one of the following will change the value of an equilibrium constant? 16) A) changing temperature B) varying the initial concentrations of products C) adding other substances that do not react with any of the species involved in the equilibrium D) varying the initial concentrations of reactants E) changing the volume of the reaction vessel 17) The magnitude of Kw indicates that. 17) A) water autoionizes very quickly B) water autoionizes only to a very small extent C) the autoionization of water is exothermic D) water autoionizes very slowly 18) What is the concentration (in M) of hydronium ions in a solution at 25.0 C with ph = 4.282? 18) A) B) 4.28 C) 9.71 D) E) ) Of the following, which is the strongest acid? 19) A) HIO2 B) HIO C) HIO3 D) HIO4 E) The acid strength of all of the above is the same. 5
6 20) The equilibrium constant for the gas phase reaction 20) N2 (g) + 3H2 (g) 2NH3 (g) is Keq = at 300 C. At equilibrium,. A) reactants predominate B) roughly equal amounts of products and reactants are present C) only reactants are present D) products predominate E) only products are present 21) Ammonia is a. 21) A) strong base B) weak base C) salt D) strong acid E) weak acid 22) The acid-dissociation constant, Ka, for gallic acid is What is the base-dissociation constant, Kb, for the gallate ion? A) B) C) D) E) ) 6
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