Monday, November
th
9
Grab a blue sheet from on top of the projector. Take out:
-16.1-16.5 packet
-Review questions 1-17
-16.6-16.7 notes
Write the chemical equation and the Ka expression for the
ionization the following acids in aqueous solution:
o HBrO2
o HC3H5O2
Announcements
• Due Tomorrow, 11/10: Problem Set 1
• Due Thursday 11/12: Le Chatelier’s Principle lab, Problem
Sets 2 and 3, Effects of Ka prelab (will be passed out
tomorrow)
• Friday, 11/13: Quiz
• Due Monday, 11/16: 16.8-16.10 notes
• Due Tuesday, 11/17: Review questions 18-25, Problem set
4
• Due Wednesday, 11/18: Problem set 5
• Thursday, 11/19 (sorry about the typo): Chapter 16 test
Lactic acid (HC3H5O2) has one acidic hydrogen. A 0.10 M
solution of lactic acid has a pH of 2.44. Calculate the Ka.
A 0.200M solution of a weak acid HA is 9.4%
ionized. Using this information, calculate [H+], [A-],
[HA], and Ka for HA.
A particular sample of vinegar has a pH of 2.90. Assuming that acetic
acid is the only acid the vinegar contains (Ka = 1.8x10-5), calculate
the concentration of acetic acid in the vinegar.
The active ingredient in aspirin is acetylsalicylic acid
(HC9H7O4), a monoprotic acid with Ka = 3.3 × 10−4 at 25°C.
What is the pH of a solution obtained by dissolving two
extra-strength aspirin tablets, containing 500. mg of
acetylsalicylic acid each, in 250. mL of water?
Rest of Period
• Be productive! You have all of your directions and due
dates
• Tomorrow: similar to today, but with bases – a few practice
problems, and then time to work