<p>5/8/2018 Name: ______Chemistry 30 Unit 3: Acid-Base Date: ______Equilibrium UA part B</p><p>Use the following information to answer the next 3 questions.</p><p>During respiration, our body’s cells metabolize glucose according to the equation</p><p>C6H12O6(aq) + 6O2(aq)  6H2O(l) + 6 CO2(aq).</p><p>1. Choose the reaction type which suits this reaction best. Justify your response with a well constructed sentence (there may be more than one suitable response, marks only given for sentence explanations, not just for a choice). (1 mark)</p><p>A. photosynthesis B. cellular respiration C. oxidation D. disproportionation</p><p>2. If our blood was not buffered, what would the metabolism of glucose lead to? Choose the best answer and justify it with a one sentence response. (1 mark)</p><p>A. become more acidic B. become more basic C. remain neutral D. lose energy</p><p>3. Hyperventilation (very rapid, deep breathing) results in rapid loss of CO2(g) from our bodies. During hyperventilation, what will happen to the pH of blood? Choose the best answer and justify it with a one sentence response. (1 mark)</p><p>A. decreases B. increases C. remains at normal levels D. becomes more dilute</p><p>4. One of the buffer systems in the human body is</p><p>– – HCO3 (aq) + H2O(l)  H2CO3(aq) + OH (aq) a) What are the conjugate acid-base pairs in this reaction? (1 mark) b) If vinegar, CH3COOH(aq), was added to this buffer system, what would happen? Explain your answer in terms of Le Chatelier’s Principle. (1 mark)</p><p>Use the following information to answer the next two questions.</p><p>LD Industries 5/8/2018</p><p>+ + NH4 (aq) + H2O(l)  H3O (aq) + NH3(aq)</p><p>5. In a system at equilibrium, the concentration of the NH3(aq) is 0.35 mol/L and the + + concentration of the NH4 (aq) is 0.25 mol/L. The pH of the NH4 (aq) / NH3(aq) solution is ______. (9.40) (1 mark)</p><p>-5 6. The Kb of this previous solution is ______. (1 mark) (1.79 x 10 )</p><p>7. In each of the following reactions, state whether the products or reactants are favored and why (0.5 marks each, given only you explain WHY!)</p><p>– – 2– a. HSO4 (aq) + F (aq)  HF(aq) + SO4 (aq) + – b. HF(aq) + H2O(l)  H3O (aq) + F (aq) 2– 4– – c. HF(aq) + SO4 (aq)  HSO (aq) + F (aq) 2- - - d. H2S(aq) + CO3 (aq)  HS (aq) + HCO3 (aq)</p><p>+ 8. Find [H3O ] and the pH of the following solutions: (1 mark)</p><p>+ a. 0.30 M HBr(aq) [H ] = ______pH = ______+ b. 0.60 M HCl (aq) [H ] = ______pH = ______</p><p>9. Find the pH of the following solutions: (1 mark)</p><p> a. 0.050 M KOH(aq) pH = ______b. 0.00080 M NaOH(aq) pH = ______</p><p>10. Name an appropriate acid-base indicator for each pH range in question 8 and 9. (0.5 marks each)</p><p>11. Caproic acid, HC6H11O2(aq), is found in coconut oil and is used in the making of artificial flavors. A + -3 solution prepared by dissolving 0.14 mol HC6H11O2 to form 1.50L of solution has [H3O ] = 1.1 x 10 -5 M. Calculate Ka for caproic acid. (1 mark) (1.3 x 10 )</p><p>12. Benzoic acid, HC7H5O2(aq), is present in many berries. A benzoic acid solution prepared by dissolving 1.00g of benzoic acid in 350.0mL of solution has a pH of 2.91. What is the Ka for benzoic acid? (1 mark) (6.47 x 10-5)</p><p>-4 132. Lactic acid (Ka = 1.28 x 10 ) is present in sore muscles after vigorous exercise. For a 1.3 M solution of lactic acid, HC3H5O3(aq), calculate the pH. (1 mark) (1.88)</p><p>14. A forensic scientist analyzed a pure substance believed to be strychnine, C21H22N2O2(s), a dibasic substance that reacts completely with HCl(aq). As one of the tests, she titrated samples of the substance with 0.448 mol/L HCl(aq) and obtained the data tabulated below.</p><p>LD Industries 5/8/2018</p><p>Is the substance strychnine? Your response should include • appropriate calculations • justification for your conclusion (3 marks)</p><p>15. When corrosive materials such as concentrated hydrochloric acid are shipped in tanker trucks, there is always the potential for accidental leakage. What steps should be taken to neutralize an accidental spill of hydrochloric acid in a roadside ditch? Explain the rationale behind your strategy. Your response should include appropriate chemical equations. (2 marks)</p><p>16. Describe a procedure that would allow you to determine if an unidentified 0.100 mol/L acid is monoprotic or polyprotic. You have available standard laboratory equipment and a range of reagents. Describe the relevant results that would help you decide whether the sample is monoprotic or polyprotic. (2 marks)</p><p>LD Industries</p>