{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Quiz 3-solutions - Version 197 Quiz 3 laude(51635 This...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Version 197 – Quiz 3 – laude – (51635) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 5.0points 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 III) [H+] = [A - ] 1. I, III 2. III 3. II, III 4. II 5. I 6. I, II 7. I, II, III correct Explanation: In deriving the equation [H + ] = ( K a C a ) 1 / 2 , we ignore the protons that result from auto- protolysis that makes both statements I and III true, and we also assume that the value of C a is large relative to the change in the concentration of the acid. In other words, we assume that the percent ioniation is low, so statement II is true. 002 5.0points Which of the following pairs of solutions would not result in a buffer upon mixing?
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern