c103-sp10-0419 - Chemistry 103 Spring 2010 Today 1. Buffer...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Chemistry 103 Spring 2010 Today 1. Buffer solutions and changes to buffers solutions. 2. Equilibrium for slightly soluble ionic compounds. Announcements 1. Ch. 15 OWL homework is active. 2. First midterm exam on Apr. 21. Chapter 14 (not 14.4-14.5, reverse osmosis) Chapter 15 (15.6 oxoacids only, not 15.9) Arrive early for assigned seat. Bring calculator and pencil or pen. 3. CSULA closure on May 21 (furlough). 4. CSULA closure on May 31 (holiday). 5. Bring textbook and calculator to each lecture.
Background image of page 1

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

View Full DocumentRight Arrow Icon
Chemistry 103 Spring 2010 2 Molecular structure and acid strength For oxoacids (H-O- acids), additional oxygen atoms pull more electron density away from the H-O bond and weaken the H-O bond, making it easier to donate the H + . HClO 2 vs. HClO K a (HClO 2 ) = 1.1 x 10 -2 vs. K a (HClO) = 3.5 x 10 -8
Background image of page 2
Chemistry 103 Spring 2010 3 Similarly for oxoacids, atoms that are more electronegative will weaken the H-O bond more, leading to a stronger acid. HOCl (HClO) vs. HOBr vs. HOH (H 2 O) K a (HClO) = 3.5 x 10 -8 K a (HBrO) = 2.5 x 10 -9 K a (H 2 O) = 1.0 x 10 -14 oxoacid : a Bronsted-Lowry acid in which the acidic proton is bonded to an oxygen atom.
Background image of page 3

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

View Full DocumentRight Arrow Icon
Chemistry 103 Spring 2010 4 Buffer solutions Buffers convert a strong acid into a weak acid and convert a strong base into a weak base. So buffers can resist changes in pH. Fig. 16.1 Buffers work because they consist of a weak acid and its conjugate base (or a weak base and its conjugate acid). Example
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This document was uploaded on 03/06/2011.

Page1 / 14

c103-sp10-0419 - Chemistry 103 Spring 2010 Today 1. Buffer...

This preview shows document pages 1 - 5. Sign up to view the full document.

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