Lecture 12--Intro to Buffers

# Lecture 12--Intro to Buffers - cH 302 53210 Introduction to...

This preview shows pages 1–3. Sign up to view the full content.

cH 302 53210 Introduction to Buffers October 30" 2009 Dilute Strong Acids When the concentration of an acid is below l0-6 M, the autoprotolysis of water will make a significant contribution to the [H3O*1 concentration (and hence the pH). Using our traditional formula in these situations will lead to false answers. Example: Compute the pH F[tl+ fxl0qA of a I F\* + lxtD h \{=-\ of HCl. l/l ^,^l; ,1\f lY %Y;^"t4* The solution: Take the autoprotolysis of water into account. #r-ur. u a/)')u method called the systematic treatment of equilibriumto do this. Steps: 1. 2. Identifo all the major species. write charge balance equation [positively charges] : [Negative Charges]. Write the Water Equilibrium. write the mass balance equations (not necessary here). Solve for [H*]. 3. 4. 5.

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

View Full Document
Derivation: 0 @ 0 l-\rO --+ H* oq u- Hd+ H++ C'o'- guulo <--+ ;-911o C"u lou.-J= L flttl t H-f 'z = C.sts-f r+11:" C.o /o 'l c6 \$*c tN&' Final Equation' [". f' - -o 0uf,+i1'' Using the quadratic formula: Example: Compute the pH of a I x 10-n M solution of HCI with the aboveformula.
This is the end of the preview. Sign up to access the rest of the 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