Monday, April 11, 2011

Friday 4/8-Stacey Titration Lab 1

When we walked into class on Friday, we grabbed three sheets: Titration Lab 1 Prelab, Part 1-The Simulation, and Part 2-The Lab.
Mr.Tucker had started the class off by going over the prelab, defining the terms listed on the worksheet such as, titration, equivalence point, and end point. If the definitions aren't visible in the picture below, I listed the definitions of the three words just above it.

Titration: A titration is a way to count the number of atoms, ions, or molecules that are present in a certain volume of liquid solution.

Equivalence Point:
The equivalence point is the point at which all the acid neutralizes the base. (The number of moles of base equals the number of moles of acid.)

End Point: A dramatic color change occurs when a base neutralizes an acid, for example, when phenolphthalein is added to an acid solution and the base is added drop by drop, at a certain point the solution will turn pink and remain pink

After we finished going over the Prelab, we then went on to the next page (Part 1-The Simulation) which has six questions that Mr. Tucker had given us the answers to.

Then finishing this sheet, we went on to Part 2-The Lab. We got with our lab groups and went to our lab tables. The purpose of this lab was to find out how much/ how many drops of NaOH (base) it takes to neutralize 10 drops of HCl (acid with 0.4M instead of 0.5M) with one drop of phenolphthalein (base indicator), also the concentration of NaOH. We did five trials on Friday, and did a sixth in class today.

After finishing all the trials, we were given an equation that enables us to find the concentration Of either an acid or a base, in our case we were solving for the base.
MBVB or Macid x Drops acid (VA)= Mbase x Drops base (VB)

This part of the lab was assigned for homework.

Some examples of the work below...

Remember, the reaction occurring is HCl + NaOH ------> NaCl + H0!

Thursday, April 7, 2011

Thursday 4/7 Maleh Acid Notes

The first thing we did this morning was grab two note shits labeled Gist and Acids/Bases. Next, Mr Tucker handed us a reading guide that was supposed to go with the fist note sheet "Gist"

He assigned every four people a section to read and take notes in. After the group took notes they were supposed to regroup and discuss the passage. If you did not get the Gist sheet it looks like this......
To sum up the purposeof this class activity, it was to get a basic understanding of Acids and Bases. It explained some properties of acids the different types of acids and it explained properties of bases as well.

After we discussed with our group the article Mr. Tucker checked in our homework from the night before which was the ven diagram that showed the differences and similarities of Acids and Bases.

Next, Mr. Tucker gave us an intro to what acids are by showing us a sweet clip from Fight Club which depicted Jack the protagonist getting a strong acid burned on his skin. Mr. Tucker also stressed the importance of wearing safety goggles as Brad Pitt did in the movie.

After this intro, Mr. Tucker jumped right into the notes. We first discussed the properties of Acids which includes the taste(sour) what it reacts with and what it can create in water. We also talked about what happens when acids dissociate in water. An example of what it looks like is: HCl-----> H^+ + Cl^- More examples are shown in the pictures at the bottom of the page. The notes also included the property of bases. He informed us that the taste is bitter, it turns litmus paper blue and creates OH- in water. He also told us what happens when bases dissociate in water, like acids the break down as so: NaOh------> Na^+ + OH^-. We finished up the class with the last part of the section by talking about weak and strong acid bases. We concluded that strong acids and bases dissolve in water, and that weak acids and bases partially separate in water. Mr. Tucker gave us pictures of what it looks like and that will be shown also in the pictures below.

Mr. Tucker concluded the class by informing us that we have a quiz tomorrow on the notes and sent us home with the only homework to study and finish up the hand warmers lab reportwhich you can find on Mr. Tucker's moodle page

Wednesday, April 6, 2011

Wednsday 4/6- Mackenzie- Acid Base Lab

The first thing we did when we walked into class this morning was pick up the Unit 11 Objectives worksheet.
The worksheet says:
Unit 11 Objectives-
11.1- Be able to describe the general properties of acids and bases.
11.2- Be able to explain and draw the difference between strong and weak acids as well as strong and weak bases.
11.3- Be able to calculate [H+], [OH-], pH, and pOH.
11.4- Predict the products of a neutralization reaction.
11.5- Be able to recreate the titration calculations from the lab.

All of these skills will be necessary in order to do well on the exam.

Next we proceeded to begin the ACID/BASE LAB.
Mr. Tucker gave us 1M NaOH, 1M HCl, and 1M HC2H3O2. (The 1M being the concentration).
NaOH is a strong base, HCl is a strong acid, and HC2H3O2 is a weak acid.
He then gave us litmus paper, Plt paper, Fe, Zn, Cu, Mg, and Pht.
We then tested the NaOH, HCl, and HC2H3O2 with each material.
In order to organize the information we put our data into a data table.
The reactions were as follows:
NaOH- turned blue
HCl- No RX
HC2H3O2- No RX
NaOH- turned blue
HCl- turned red
HC2H3O2- No RX
HCl- No RX
HC2H3O2- No RX
HCl- No RX
HC2H3O2- No RX
HCl- No RX
HC2H3O2- No RX
HCl- Bubbling and smoking
HC2H3O2- Bubbling straight off of the Mg
NaOH- turned blood red/ purple ish
HCl- turned white
HC2H3O2- No RX

Our homework for tonight is to do a venn diagram explaining the similarities and differences that you noticed between Acids and Bases during the lab today. Also, write one sentence that sums up what you found out from the lab today, what did you learn?