{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

03-10-08 - Chem 31 3/10 Lecture Announcements 1 Exam...

Info icon This preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Chem. 31 – 3/10 Lecture
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
Announcements 1. Exam Results:  Average = 73% Score N 90-98 9 80s 17 70s 11 60s 10 50s 9 <50 7
Image of page 2
Announcements 2. New homework assignment posted (and  handed out with exam) 3.  Information about tap water also now  posted
Image of page 3

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

View Full Document Right Arrow Icon
Announcements Parts of Exam that gave most people difficulties
Image of page 4
Solubility Product Problems   Solubility of Mg(OH) 2  in Common Ion If we dissolve Mg(OH) 2  in a  common ion  (OH -  or Mg 2+ ), from Le Ch â telier’s  principle, we know the solubility will be  reduced Example 1) What is the solubility of Mg(OH) 2   in a pH = 11.0 buffer? In this problem, because of buffer, pH is  fixed, so [OH - ] also is fixed, and NO ICE  TABLE NEEDED
Image of page 5

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

View Full Document Right Arrow Icon
Solubility Product Problems   Solubility of Mg(OH) 2  in Common Ion Example 2) Solubility of Mg(OH) 2  in 5.0 x 10 - 3  M MgCl 2 .
Image of page 6
Solubility Product Problems   Precipitation Problems What occurs if we mix 50 mL of 0.020 M  BaCl 2  with 50 mL of 3.0 x 10 -4  M  (NH 4 ) 2 SO 4 ? Does any solid form from the mixing of ions? What are the concentrations of ions  remaining?
Image of page 7

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

View Full Document Right Arrow Icon
Precipitations Used for Separations Example:  If we wanted to know the concentrations of Ca 2+   and Mg 2+  in a water sample.  EDTA titration gives [Ca
Image of page 8
Image of page 9
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