Quiz 3, Spring 2011 - Version 280 Quiz 3 laude (51635) This...

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Version 280 – Quiz 3 – laude – (51635) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 5.0 points Which oF the Following pairs oF solutions would not result in a bu±er upon mixing? 1. 1 L oF 0 . 25 M HClO 2 ; 1 L oF 0 . 15 M CsOH 2. 2 L oF 0 . 1 M LiOH; 1 L oF 0 . 1 M NH 3 correct 3. 2 . 5 L oF 0 . 1 M NH 4 + ; 1 L oF 0 . 1 M Ca(OH) 2 4. 3 L oF 0 . 2 M NaOH; 4 L oF 0 . 2 M H² 5. 1 . 5 L oF 1 M HCl; 1 L oF 2 M CH 3 NH 2 Explanation: 2 L oF 0 . 1 M LiOH mixed with 1 L oF 0 . 1 M NH 3 would simply be a strong base solution, as the strength oF the LiOH would overwhelm the NH 3 and prevent rather than promote Formation oF its conjugate acid NH 4 + . 002 5.0 points Which oF the Following assumptions are made when treating the equation [H + ] = ( K a C a ) 1 / 2 as a good approximation oF the proton concentration oF a weak acid solution? I) water’s contribution to the proton con- centration is negligible II) the percent ionization is low
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This note was uploaded on 09/17/2011 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.

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Quiz 3, Spring 2011 - Version 280 Quiz 3 laude (51635) This...

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