Class Notes Jan 20

Class Notes Jan 20 - 1/20/2010 Announcements: Wednesday,...

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

View Full Document Right Arrow Icon
1/20/2010 1 Announcements: Wednesday, January 20, 2010 Homework WebAssign #3- Due Wednesday, January 27 at 8:00 AM CLASS Survey Must be completed online by Friday 1/23 at 5:00 PM Recitation Week 2- “Equilibrium-Weak and Strong Acids” ** Monday recitation sections- Please attend another session this week! ** Lab Next Week Lab Familiarization and Lab Check-In ** Monday lab sections will check in week 3.** Suggested Textbook Questions Continue Chapter 18 problems. What is the pH of a 1x10 -4 M HI(aq) solution? (K a (HI) >> 1) January 20, 2010 – CT#1 A. 7.0 B. 10.0 D. 14.0 E. Not enough information C. 4.0 HI dissociates completely! [H 3 O + ] = 1x10 -4 M pH = 4.0 Acidic! 1.00 x 10 - 9 3 sig figs -log(1.00 x 10 -9 ) = 9 . 000 Significant Figures with Logs 1.00 x 10 - 11 3 sig figs -log(1.00 x 10 -11 ) = 11 . 000 Numbers before the decimal point come from the exponent. These digits are NOT significant. Numbers after the decimal point are significant! 1.0 x 10 - 9 2 sig figs -log(1.0 x 10 -9 ) = 9 . 00 Weak Acids Weak acids (and bases bases) do not dissociate completely.
Background image of page 1

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

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

This note was uploaded on 03/23/2010 for the course CHEM 1131 taught by Professor Redin,kend during the Spring '08 term at Colorado.

Page1 / 2

Class Notes Jan 20 - 1/20/2010 Announcements: Wednesday,...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online