Friday May 6th

Friday started off like every other day in Mr.H's 3rd period class . Began finishing up calculations for LAB AB2. We worked for 5 minutes and then moved on to going over the reading sheet from the past night.
Reading Sheet 13.5-6
1. a. WB
b. N
c.WB
d. SB
e. WB
f. WB
g. N
h. N
2. C
3.D
4. D
5. D
6. A
7. B
8. A
9. C D
10. C
11. FALSE
12 A B C
13. B D
14. B
15. a. Neutral
b. Basic
c. Acidic
16. C

Next we moved on the the main part of the class period where we moved to page 9.

We started with problem 21 where we needed to rank strength of the acids. The key to this was the number closest to 0 was the weakest acid. After this we proceeded to the next problem.

For Problem 22. we needed to examine the aqueous solutions and determine the major species within them. This meant that we first had to determine if something was a strong or weak electrolyte. Then if it was a strong electrolyte then it broke apart into ions and the weak ones did not. So for part a. the solution NaOH is a strong electrolyte meaning that it would break apart into the major species Na+ and OH-. The solution of acetic acid is a weak electrolyte so then the acid does not break apart so the major species would be HC2H3O2.
The next 4 problems followed the similar pattern.
We then moved on the next page.... which is a problem....
To do these problems you need to do some sort of stoichiomestry...ummm....
well...
yah.... um
I think... you start by determining the major species. then for some reason the Na and Cl are insignificant... so you are left with the equation H+ + OH- ===> H2O
Next you convert from .05 L of HCl to the moles of H+ ions. the conversion factor is... (.05 L*.1)/1L= .001 mol H+
This you convert from H+ to OH- which is a 1 mole over 1 mole conversion factor meaning that there are .005 mol OH
then you convert to volume of NaOH. this looked like (.005*1mol*1L)/(1 Mol*.25mol)
this gave us a answer of .02 Liters.
Im sorry for the crummy explaination... my bad...
Next we moved onto the steps if titration for lab AB3
the steps were
1. Clean Buret
2. Fill buret until 0 mark
3 mount buret
4. Clean Flask
5. add acid to flask
6. Add 2 drops of indicator to flask
7. titrate while stirring flask
8. once color changes record buret amount.

After this the period ended.
If your bored, or if your from slovenia you should watch this video.
It has nothing to do with this class but why not. http://www.vimeo.com/23396791