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hw 5 - rhodes(ajr2283 Homework#5 Holcombe(52460 This...

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rhodes (ajr2283) – Homework #5 – Holcombe – (52460) 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 Of the following, a solution with which pH would be the most basic solution? 1. 7.0 2. 4.0 3. 11.2 correct 4. 10.2 Explanation: The higher the pH of a solution the greater is its basicity. 002 10.0 points A solution of CO 2 dissolved in water is 1. precipitated. 2. acidic. correct 3. neutral. 4. basic. Explanation: 003 10.0 points A solution in which the molarity of the hy- droxide ion is larger than the molarity of the hydronium ion is termed 1. acidic. 2. neutral. 3. electrolyte. 4. amphiprotic. 5. basic. correct Explanation: 004 10.0 points Which of the following is true for strong acids? 1. They are weak electrolytes. 2. Aqueous solutions of strong acids have a high pH. 3. They are almost totally ionized or disso- ciated in aqueous solutions. correct 4. They react only with weak bases. 5. After they lose a proton, they give rise to strong conjugate bases. 6. They react only with strong bases. Explanation: The term ‘strong’ implies the species fully ionizes or dissociates; it does not imply any particular pH. 005 10.0 points If the pH of a solution is 3, then the hydro- nium ion concentration is ? the hydroxide ion concentration. 1. lower than 2. the same as 3. higher than correct Explanation: Since pH = 3 the solution is acidic and [H 3 O + ] > [OH ]. 006 10.0 points An Arrhenius base must contain ? and dis- sociate in aqueous solutions to produce ? . 1. the hydroxide ion or hydroxyl group; hy- droxide ions correct 2. hydronium ions; a solution whose pH is less than 7.0 3. an unshared pair of electrons; a nonelec- trolytic solution
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rhodes (ajr2283) – Homework #5 – Holcombe – (52460) 2 4. an unshared pair of electrons; an elec- trolytic solution 5. hydrogen; hydrogen ions Explanation: The Arrhenius theory of acids and bases defines bases as substances which in water give off hydroxide ions.
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