chem hw 5 - lawrence (cdl678) Homework #5 Holcombe (52460)...

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lawrence (cdl678) – Homework #5 – Holcombe – (52460) 1 This print-out should have 25 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points OF the Following, a solution with which pH would be the most basic solution? 1. 11.2 correct 2. 10.2 3. 7.0 4. 4.0 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. acidic. correct 2. precipitated. 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. amphiprotic. 2. basic. correct 3. electrolyte. 4. neutral. 5. acidic. Explanation: 004 10.0 points Which oF the Following is true For strong acids? 1. They are weak electrolytes. 2. They react only with strong bases. 3. They are almost totally ionized or disso- ciated in aqueous solutions. correct 4. Aqueous solutions oF strong acids have a high pH. 5. AFter they lose a proton, they give rise to strong conjugate bases. 6. They react only with weak 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. higher than correct 3. the same as 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. an unshared pair oF electrons; an elec- trolytic solution 2. hydronium ions; a solution whose pH is less than 7.0 3. hydrogen; hydrogen ions
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lawrence (cdl678) – Homework #5 – Holcombe – (52460) 2 4. an unshared pair of electrons; a nonelec- trolytic solution 5. the hydroxide ion or hydroxyl group; hy- droxide ions correct Explanation: The Arrhenius theory of acids and bases deFnes bases as substances which in water give o± hydroxide ions. The pure substance will be a metal oxide or hydroxide. 007
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This note was uploaded on 04/09/2010 for the course CH 52460 taught by Professor Holcombe during the Spring '10 term at University of Texas at Austin.

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chem hw 5 - lawrence (cdl678) Homework #5 Holcombe (52460)...

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