Titrations and More!

Tuesday and Wednesday April 29-30 2014

What we did in class (29th):

• Today in class we finished the indicator lab
• We went over the things that were due on THURSDAY for the lab
• Mrs. Friedman showed us an example problem that would have to do with the homework

What is due for the Lab:

• The Lab is due THURSDAY
• You need a typed data table, it's not required that the calculated pH's be on the type table
• You also need a sheet with all of the calculations required
• You need to do calculations for the following:
• .001 M HCl
• .001 M NaOH
• .001 M Acetic Acid
• .001 NH4OH
• .1 M NaCl
• .1 M Na3PO4

For Extra Credit you could do calculations for .1 M NaHSO3 and .1 M NaHCO3

Other Homework:

• The last two sheets of the packet on Acids and Bases
• This includes the two ICE Table questions on Buffers (which are done exactly the same way as common-ion problems) and the last sheet which is a general practice of ICE Tables
• These sheets are due WEDNESDAY

What we did in class (30th):

• We went over the last two sheets of the acids and bases packet
• Mrs. Friedman's computer crashed (condolences)
• We took notes on Neutralization Reactions and Titrations

Neutralization Reactions:

Acid + Base ---> Salt + Water

Ex. HCl + NaOH ---> NaCl + H2O

For every mole of H+ or H3O there should be one mole of OH to neutralize it = Titration

When you know the concentration of a base, you can find the concentration of the acid using Titration

Equivalence Point: When moles of H+ = moles of OH- = pH of 7

End Point: When the indicator is at it's faintest color possible

Overshoot: When the indicator color is too strong, you passed the end point

Calculation for Concentrations:

# of H's in the formula x Molarity of Acid x Volume of Acid = Molarity of Base x Volume of Base x # of OH-'s in the formula

Homework due Thursday:

• The lab as mentioned above
• Two practice problems that are on one of the lab sheets we received today

Next Blogger: Colin Samuels

Quiz Review

Friday, April 25, 2014
Blogger: Serene P.

Today, we began class with completing a worksheet in a group. It covered questions similar to the quiz we took on Thursday. Later, we went over the answers to this worksheet. To Georgia, Cameron, Juliette, and Hayden, you all will have to complete this worksheet when you return. 

After completing that worksheet, we made corrections to the quiz we took on Thursday. It was not taken for a grade since many people did not do so well. 

Homework:
There is one worksheet that has a problem similar to the worksheets that we were going over in class.
Also, there is a webassign that I believe is now due Monday. 

The next blogger is Daniel W. 

Quiz

April 24, 2014
Blogger: Serene P.

Due to the Juniors testing, we all had shortened periods today. Ms. Friedmann had us check in our homework on pages 10-11 at the start of class. Afterwards, we took the quiz that was over those pages. We did not go over the homework. 

Homework:
There is a webassign due Sunday night at 11:59 PM. 

I'll blog tomorrow as well. 

During class today Mrs. Friedmann recorded a video going over problems on pages 10 and 11 in the packet.  You can find this video on the moodle page.

She also went over the answers to the homework that you can find under the "keys" folder.

The homework is the 2 web assigns due wednesday night, and pages 10 and 11 in the packet, do all the problems Mrs. Friedmann did not go over.

There will be a quiz Thursday on problems like the ones on the homework.


the next blogger is... Serene P.

OK, so...the video on yesterday's lesson was supposed to be uploaded by 7 pm last night, so on the bright side I'm only 17 hours late.  Sorry!  The link is at the bottom of the Unit 10 box on Moodle.  Tomorrow's quiz will be a problem similar to questions 34 and 35 on pages 10 and 11 of the packet, which the video covers.

Don't forget to enjoy the sunshine!  :)  See you tomorrow.

Ms. F

Hi, class!  Given that we have not yet discussed buffers in detail in class yet, I have elected to move the deadline for the Buffers WebAssign to SUNDAY NIGHT, 11:59 pm.  The other WebAssign (on Kb and salts) is still due tomorrow night (Wednesday 4/23) by 11:59 pm.  By Thursday you should also have completed pages 10 and 11 in the packet...for those of you absent today a video of today's lesson will be posted by 7 pm tonight.  Quiz Thursday, during our 20 minute period (it will be a problem calculating the pH of a salt).

Happy ICEing!

Thursday, April 17th

Thursday, April 17th 2014!

Happy three-day weekend!

We began the class taking a quiz based on the weak acid/base ICE tables. This is not meant to be a super duper hard quiz, but reinforcing the idea. Hope everyone did acidllent! 

OH, if you have not taken this yet, please talk to Mrs. Friedmann pHSAP. 

With the second half of the class, we took notes in the packet. We completed a few examples on pages 6 and seven, which were not up on Moodle yet.


Homework:
Finish pages 6 and 7 of the packet and to have a great three-day weekend!

The next blogger will be…Mary L. 

Homework: Web Assign due tonight at 11:59 pm. & last 2 pages of the packet.

Today in class we went over our homework, packet pages 4-5. The packet and answer key can be found on Moodle in the Unit 7 handouts folder. Mrs. Friedmann also passed back and went over our quizzes.

**QUIZ TOMORROW ON ICE TABLES FOR STRONG AND WEAK ACIDS AND BASES**

Next Blogger: Lauren B.

Acids and Bases

An Overview of the Unit

Today in class Mrs. Friedmann went through a set of notes with us that was an overview of our current unit.  If you missed them, the notes can be found in the Unit 10 notes folder.  Mrs. Friedmann asks that you hold onto your big questions, because it would be easier for her to answer them at the same time that we're learning it. AKA big questions=big lesson.  We picked up a calendar and a packet today, which can be found in the Unit 10 handouts folder.  

and remember... hydrofluoric acid eats through pretty much everything, except plastic.

Bathtub Scene

Homework:

1. 2 web assigns due tonight at  11:59

2. Finish the acid/base properties lab write up

3. Complete the first three pages of the packet we received today. 

The next blogger is: Georgia A.

Acid/Base Properties Lab Data

Here is the data for the Acid/Base lab from Friday:

Conductivity
(1) HCL-- No
(2) HC2H3O2--No
(3) Distilled Water--No
(4) Ammonia--No
(5) NaOH--No

Litmus Paper

	Base Red	Base Blue
(1) HCL	No	Yes
(2) HC2H3O2	No	Yes
(3) Distilled Water	No	No
(4) Ammonia	Yes	No
(5) NaOH	Yes	No

pH Paper

	pH
(1) HCL	1
(2) HC2H3O2	3
(3) Distilled Water	7
(4) Ammonia	9
(5) NaOH	11

Phenolphthalein

	Observation
(1) HCL	White & Cloudy
(2) HC2H3O2	Clear
(3) Distilled Water	White & Cloudy
(4) Ammonia	Dark Purple
(5) NaOH	Bright Purple

Universal Indicator

	Observation
(1) HCL	Orange/Pink
(2) HC2H3O2	White/Red
(3) Distilled Water	Light Green/Yellow
(4) Ammonia	Purple
(5) NaOH	Turquoise

Carbonate

	Observation
(1) HCL	Reacting, bubbling
(2) HC2H3O2	None
(3) Distilled Water	None
(4) Ammonia	None
(5) NaOH	None

Magnesium

	Observation
(1) HCL	Reacting, bubbles quickly, fizzing, steams off
(2) HC2H3O2	Slower reaction
(3) Distilled Water	None
(4) Ammonia	None
(5) NaOH	None

The link to the video going over stuff for tomorrow's quiz on Le Chatelier and Ksp is now posted, check it out, especially if you were absent today (I'm talking to you, field trippers!)  It's at the bottom of the Unit 9 box on Moodle, for your viewing pleasure.  Popcorn optional.  :)

Prep for Quest

By: Katie Coy

Overview:
Hello all who were 'absent' (aka on an AP Euro field trip) today! We started off class today by talking about the homework question that was assigned last night. It was actually not a common ion problem, rather it was a solution stoichiometry problem from earlier in the year. We did not go over how to solve this problem in class and you will not have to know how to solve this problem on the Quest tomorrow. Speaking of the quiz... we do have a Quest on LeChatelier's Principle that TOMORROW! Ms. Friedmann is going to post a VIDEO that goes through all that we reviewed (we did not learn anything new) today. I currently do not see the video posted, but do not fret, Ms. Friedmann said she will post it as soon as it uploads. Keep checking the unit 9 box on the Moodle page for the video on today's lesson. If you do not want to watch the video, I will post a quick summary of all that we learned today... hope it is helpful. :)

What is going to be on the Quest:

1. LeChatelier's Principle- qualitative questions such as "If more CO is added to this equation, will it shift to the right or to the left?"   
2. Ksp common ion problems
3. Ksp problems
1. Calculate the concentrations of substances at equilibrium
2. Calculate Ksp using solubility- these can be found in the packet that we did, questions 8 a,b,c, and d.

Number two is what we went over today, since Ms. Friedmann felt that we could benefit from more information on common ion problems.

Common Ion Problems:

These are the problems in which we are dissolving a substance into something other than pure water. We went over an example problem that is explained in the video, so I will just talk about the steps that we took to solve the problem. 

Example one: What is the solubility of PbCl2 in 0.100 M MgCl2? The Ksp of PbCl2 is 1.7(10^-5). As one can see, the solubility (aka x) is what you should be solving for. Again, if you would like and explanation of this please visit the wonderful video Ms. Friedmann is going to post.

Solubility and Ksp Problems:

Another thing that we reviewed today was the formulas that we learned yesterday. Those formulas are:

# of ions produced:

2                                                  the square root of Ksp

3                                                  the cube root of Ksp/4

4                                                  the fourth root of Ksp/ 27 

These are used to figure out the solubility of equations without using the ICE tables. YOU SHOULD MEMORIZE these equations for tomorrow's quiz. Anyways, you may be wondering when we use these formulas. Well, when you are given a question that reads, 'Which of the following has the lowest solubility?' use the equations. Here are the notes that we took in class. Again, if you are confused on this topic, please consult Ms. Friedmann's video.

Homework:

1. Study for the Quest!

One other important thing, Ms. Friedmann wanted to tell everyone that she apologizes for not giving the usual homework so that we could prepare for the quest. With her busy life outside of school, it has been very hard for her to assign homework and to post items (like keys) on Moodle. She thanks all of us for being very patient. 

Good luck studying and the next blogger is.... Georgia.

Common Ion Problems...

Overview:
- Today we went over the Ksp packet in class and Mrs. Friedmann reviewed how to do each type of problem. She also added some notes to the last page of the packet. In addition Mrs. Friedmann told us about the upcoming science contest that we could participate in. Lastly we took some notes about solving common ion problems.

Science Contest: 
 - This is the same contest that some of you may have participated in groups last year. And although there will be no extra credit given for attending the event, it will still be a great experience that is worth much more than extra credit points!!!

Ksp Packet Review...
- Mrs. Friedmann went over how to do each problem in the packet, such as calculating concentrations, ksp, or S (solubility). All of these problems involve using the ICE methods and finding out the Ksp expression which is similar to finding Keg. This packet with the answers is posted on moodle.

Common Ice Problems...
- This method is used to solve solubility of substances in another solution (not in water like the ones in the Ksp packet).  This is important because instead of starting of with 0 on the product side, you start of with a certain concentration since the we are dealing with a certain solution not just plain water.
Here are the notes...

Homework...
-Answer this problem: How many grams of CaSO4 are formed when 20mL of 0.010M Na2SO4 are added to 100mL of 0.001M CaCl2.


Next Blogger is Katlin Coy...

The Solubility Product Constant

Overview:
- Today in class, Mrs.Friedmann had to leave urgently, so Mrs. Mandarino taught us the four pages of the solubility product constant packet that was passed out yesterday. We went over the first page that was assigned for homework.

- The new problems are similar to the ice problems, so you can use them as a reference to solve these.

Homework:
-No official homework besides finishing the next four pages of the packet.

Thursday April 3

Blogger: SUVd

Dear Period 5,
Today was a shortened day due to the fire drills, so our class 5 minutes shorter than usual. At the beginning of the class, Ms.Friedmann checked in our homework which were the two ICE sheets. We also turned in our typed Post-Lab Questions for the Le Chatelier's lab. Then we grabbed a packet from the usual front table. The first page was homework, and it will be checked in tomorrow (It's FRIDAY!!!!). Afterwards, we went over yesterday's homework and the test.  Oh yeah, lastly, Jordan found a lot of "Easter Eggs" with significant figures.

Sincerely,

Suvd D.

P.S Ambreen, you're next...

ICE paper

"Easter Egg"

Chatelier is right

http://en.wikipedia.org/wiki/List_of_Google_hoaxes_and_easter_eggs

                             

Kevin M

LeChatelier Lab

Homework:

          1: Finish ICE problems worksheets handed out yesterday. DUE tomorrow. Here is the worksheet

          2: Type the answers to the post lab questions. DUE tomorrow. Here is the lab

          3: If you did not watch the video and take notes last night. Do it tonight. Here is the link

We had a substitute today and we did the LeChatelier's Principle Lab. Before the lab, we went over the answers to the pre-lab but they are not on moodle yet so if you need to see the answers you must wait until class tomorrow. All of the procedure and information for the lab can be found in the link above. 

In the lab, we were able to see all of our recent work take effect in an actual reaction. We prepared 6 test tubes with Cobalt Chloride. We set A as the control tube and experimented with the others. To test tube B we added distilled water, which changed the color of the substance. It changed from blue to pink. This means that when H2O is added, the reaction moves to the left! I get excited about these things.

Here is the data Table:

Test Tube	Final Color
A	Clear Blue
B	Pink	In Hot Water: Back to Blue
C	Light Blue	In Cold Water: Back to Pink
D	Thick Blue at Bottom
E	Clear Purple
F	Cloudy Pink

Reminder to type the postlab for credit tomorrow. Don't forget the ICE problems!

Next Blogger is: Suvd

Happy April Fools Day!

Happy April Fools Day!

The first thing we did in class was check in the homework from last night and tape into our journals the lab and the ICE problems worksheet. Next, we took a partner quiz on Le Chatelier's principle. Then we went over the homework from the night before.

Tonight's homework assignments are:

1. the WebAssign due tonight at 11:59
2. the pre-lab for the Le Chatelier's principle lab
3. watch this video and take notes on it
4. the ICE problems worksheet, due Thursday

The next blogger is: Kevin M