# 20B_HW5 - [CH 2 ClCOO[CH 2 ClCOOH at 25 ºC For each...

This preview shows page 1. Sign up to view the full content.

CHEM 20B Winter 2010 Homework #5 - Due Monday, February 8 th 1. Oxtoby 14.38 2. Oxtoby 15.2 3. Oxtoby 15.14 4. Oxtoby 15.18 5. Oxtoby 15.30 6. Oxtoby 15.36 7. Oxtoby 15.40 8. Consider the family of acids HF, HCl, and HI. State which acids are strong and which acids are weak? Put the acids in order from strongest to weakest. Then explain why the acids show this trend. You will have to draw on bonding concepts from Chem 20A to answer this question. 9. The K a for chloroacetic acid (CH 2 ClCOOH) is 1.4 x 10 -3 at 25 ºC. Given an initial concentration, calculate the pH and the ratio of conjugate base to acid at equilibrium (i.e.
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: [CH 2 ClCOO-]/[CH 2 ClCOOH]) at 25 ºC. For each concentration, do the calculation both exactly (i.e. using the quadratic equation), and using the approximation that the extent of reaction is small compared to the initial concentration of acid. Over what range is the approximation valid? Initial concentrations are: (a) [CH 2 ClCOOH] = 1.000 M (b) [CH 2 ClCOOH] = 0.500 M (c) [CH 2 ClCOOH] = 0.100 M (d) [CH 2 ClCOOH] = 0.010 M...
View Full Document

{[ snackBarMessage ]}

### What students are saying

• 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.

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

• 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.

Dana University of Pennsylvania ‘17, Course Hero Intern

• 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.

Jill Tulane University ‘16, Course Hero Intern