Electrochemistry

What is it all about?

First up - assigning oxidation numbers & balancing electrochemical equations.

Have you, in the last few weeks encountered a titration lab that left you more mixed up that a well dissolved salt & water solution?
Would you like a chance to redeem yourself?
Block off time after school on Wed Dec 16th and Thurs Dec 17th for an opportunity to standardize a base (Day 1 - Wed Dec 16th) and then determine the molar mass of a weak monoprotic solid acid (Day 2 - Thurs Dec 17th).
Do you require further details?
Additional infomation has been moodlized.
See Acid Base Titrations - 3rd Times the Charm? {or you local Chem*Is*Try teacher}

Test Rvw

Good day Chem*Is*Try-ers

The Acid/Base Equilibrium Questions (The review) have been moodlized. [The solutions were scanned, resized and then loaded up to moodle] There are full solutions to the first 8 questions. The 0.150M questions have numeric answers. The acetic acid/NaOH abcd question have partial solutions.

A reminder:
There are basically 3 question types
(1) those involving pH and strong/weak acid/bases & salts
     -weaks are on the p803 chart
     -%ionization fits in this group as well - go back and look at earlier examples
(2) Buffers - weak and its conjugate ion salt -llbm reactions
    -versions of buffer questions - yet again - go back and look at earlier examples
    -buffer upset with strong acid or base
(3) Neutralization questions - those that combine acid and base  - forward reactions
    -pH at equivalence point (all A and B comsumed, becomes pH of salt)
    -one reactant leftover
            -weak leftover, since conjugate ion also produced, becomes a buffer
            -strong leftover, calc pH of leftover strong

Don't forget about the Buffer/Neutralization/Titration questions - all solutions moodlized. Some images may be PDF - requires Adobe Reader to view
The question forum is available as well.
Mind you, some people get up at 5am, so late at night is earlier for early risers.

Finally, there is always the early morning option for those last minute questions. The early riser arrives just shortly after 7am.

Post 7Up & Test Review

Well that lab write-up is done.

(Well it is complete for most.)

Next up - unit test.
If you cannot wait until next day's class to get cracking on the review, the review sheet has already been moodlized.

Don't forget that the Buffer/Neutralization/Titration questions are all fair game for the test. If you experience technical difficulties opening some of the files, you may need to download Adobe reader. [Adobe Reader is commonly used program to read PDF files.]

 What do you get when you cross a snowman with a vampire?  [Frostbite.]  What do you get from a pampered cow? [Spoiled milk.]  What's brown and sticky?  [A stick.]

7 Up lab

Did anyone google titrating 7Up?

[ Just asking.]

Extra time on your hands? The unit review sheet is on moodle.

Also, the solutions to many of the previously assigned questions have been moodlized.

More A/B stuff

The unit at a glance:

Find the pH of
 - strong acid and/or base
 -weak acid and/or base
 -acidic/basic salt

Find the pH of
 - buffer (no ICE)
 -buffer after being upset with a small amount of strong acid/strong base (ICE needed)

Collection of neutralization type reactions : acid + base --> salt + water
-begin as a neutralization reaction, may evolve into a buffer or pH of a salt type question
for the statements below:
strong = strong acid or strong base
weak = weak acid or weak base

strong + strong --> neutral salt + water
 if only products, pH = 7 (neutral salt and water)
 if excess= strong, determine moles leftover, total voluem, calc conc then pH

strong + weak --> salt and water
-if all reactant consumed (equiv point) only product salt leftover, determine moles of salt, total volume, get conc, then question becomes llbm type for pH of salt (ICE chart required)
-if reactant weak leftover, then weak + salt = buffer question, set llbm for weak A/B buffer, need total volume and resulting con of weak and salt
-if reactant strong leftover, determine moles of strong leftover, total volume, then pH (can ignore weak A/B salt, insignificant compared to strong)

From today - p614 - 6 & 9
Don't forget % ionization and the remaining questions on the buffer/titration/neutalization handout (complete solutions on moodle)