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HW5-ex2 - dsj294 hw05 Holcombe(53570 This print-out should...

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dsj294 – hw05 – Holcombe – (53570) 1 This print-out should have 25 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Which of the following is true for strong acids? 1. They are weak electrolytes. 4. They react only with weak bases. 3. They react only with strong bases. 4. Aqueous solutions of strong acids have a high pH. 5. They are almost totally ionized or disso- ciated in aqueous solutions. correct 6. After they lose a proton, they give rise to strong conjugate bases. Explanation: The term ‘strong’ implies the species fully ionizes or dissociates; it does not imply any particular pH. 002 10.0 points If a bottle of wine is not sealed properly, oxygen can seep in and oxidize some of the alcohol to produce acetic acid. What would this do to the pH in the bottle? 1. It would decrease the concentration of hydrogen ions in solution. 2. It would increase the pH relative to a bottle where no oxidation had taken place. 3. The pH would stay near neutrality be- cause there is water in the wine. 4. It would decrease the pH relative to a bottle where no oxidation had taken place. correct 5. It would not affect the pH since the bottle had not been opened. Explanation: pH = - log[H 3 O + ] As acidity (concentration of H 3 O ) in- creases, pH decreases. 003 10.0 points As NaOH is added to an aqueous solution, the pH will 1. decrease. 2. increase. correct 3. Not enough information is given to solve the problem. 4. be unaffected because NaOH is not an acid. 5. increase or decrease depending on whether the initial pH is higher or lower than 7. Explanation: Acids have a pH below 7, bases have a pH above 7. NaOH is a strong base. 004 10.0 points What is the conjugate acid of ClO 3 ? 1. ClO 3 does not contain OH , so it is not a base and thus cannot have a conjugate acid. 2. Cl 3. HClO 3 correct 4. H + 5. OH 6. ClO 4 7. HCl Explanation: Since the question asks for the conjugate acid, we can assume ClO 3 is acting as a base.
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