Q2: Week 5 – 12/13 – 12/17
Jump to: Tuesday, Wednesday, Thursday, Friday
12/13 – Monday – B Day – 2, 3b/4 Lab
a) To begin Lab 14 – The amount of aspirin in a Bayer tablet.
b) To meet Lab assistant Ben
Period 3:
1. Sign off on the Aspirin plan.
2. Make strong base solution – Consider the fact that you have 100.0 ml volumetric flasks and you need some of the base you made to standardize with KHP. The arbitrary values you decide on are very important!!
3. Standardization of KHP
Period 3/4:
1. Sign off on the Aspirin plan.
2. Make your acid and base solutions – Consider the fact that you have 100.0 ml volumetric flasks and you need some of the base you made to standardize with KHP. The arbitrary values you decide on are very important!!
3. The Standardization of NaOH with KHP Titration.
4. Final Titrations –
a) Heat the aspirin solution with alcohol and base solution AND KEEP WARM for about 15 minutes while you do other things. Boiling will denature the organic reactants!!! You must monitor the heating.
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Lab 14 – The Determination of aspirin in a Bayer tablet



1. Title Page.
2. Objective.
3. materials
4.a detailed procedure
a) Design of lab – (arbitrary values decided on)
b) Calculations and steps to make certain solutions required in Lab.
c) Steps in the actual lab
5. Data Table
6) typed calculations page that report the milligrams of aspirin. Tablet the final result. (DO NOT FORGET ANY CHEMICAL REACTIONS!)
No Background, Results section or Conclusion necessary!
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12/13 – Monday Homework: –
1. Begin your Lab 14 write-up. I have shared a google doc with you to complete the assignment with. The requirements are given above. Please get on this as I will be moving on to the next stoichiometry topic very soon. Our next connecting idea is volumetric titrations with redox reactions. It is very similar with acid base titrations except we are not matching protons with hydroxides. We are matching the electrons lost to the electrons gained.
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12/14 – Tuesday – A Day – A Day – 2/3a Lab, 4
a) To Continue with determining the milligram of Aspirin in a Bayer tablet.
b) To Review balancing redox reactions in an acid or basic solution (HW).
Period 2/3:
Lab 14 Hints:
Notes For the Homework:
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12/14 – Tuesday Homework: –
2. Please read the connections above.
View Download
View Download
View Download
How to balance redox reaction in acid environment (College version) Lecture:
How to balance redox reaction in basic environment (College version) Lecture:
End of Tuesday..
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12/15 – Wednesday – B Day – 2, 3b/4 Lab
a) To identify strong oxidizing agents.
b) To balance redox reactions in acidic or basic solutions
c) T0 use the standard reduction potential table to predict spontaniety especially with protons from acids and metals.
Period 2:
1. Final Lab 14 comments and discussion
2. Redox 2.0 begins
Period 3/4:
1. Final Lab 14 comments and discussion
2. Redox 2.0 begins
3. Table T
Today’s Notes:


(NH4)2Cr2O7(s) ——> Cr2O3(s) + N2(g) + 4H2O(g)
|
Notice the that 2 protons oxidize other chemicals and thus gain 2 electrons to produce hydrogen gas. Notice that all half reactions below it have negative standard potentials because these half reactions are MORE spontaneous in the Reverse Reaction thus they are better at getting oxidized, which means the proton is ONLY a strong enough oxidizing agent to those chemicals (metals) on the right and below the standard cell half reaction. This means acids that only produce protons can only produce hydrogen gas with those metals reactive enough (below it ). Example: HCl can produce hydrogen gas with Pb (E0cell = 0.13) but not with Cu (E0cell = – 0.34) |

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12/15 – Wednesday Homework: –
1. Complete your write – up of the Aspirin Lab 14 – It is due Monday! 2. Please complete the following released AP problem with we using the video below:
End of Wednesday.
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12/16 – Thursday – A Day – A Day – 2/3a Lab, 4
a) To identify spontaneous reactions through standard reduction potentials and terrible Table J!
a) To balance Redox reactions in acid or base solutions and use the reactions in Volumetric Titrations.
1. Homework review – Hey was there a back titration in the homework? Can you balance a redox reaction – college method? The methods used in the problems in the back problems of last nights homework are the same methods used in the TUMS and Aspirin lab!!!!
2. Standard Reduction Table vs. Table J , Reactivity of Metals
3. Determining Spontaneous Reactions based on strength of agents with both tables
4. LAB 15 – pre lab and completed the Standardization and final Titration – Calculations tomorrow!!
Period 4:
1. Homework review – Hey was there a back titration in the homework? Can you balance a redox reaction – college method? The methods used in the problems in the back problems of last nights homework are the same methods used in the TUMS and Aspirin lab!!!!
2. Lab 15 prep for tomorrow
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Lab 15 – The Determination of the Concentration Oxalic Acid by a Volumetric Redox Titration
When oxalic acid mixes with other minerals, it forms oxalate. People regularly use the two terms interchangeably to refer to the same thing. Your body produces oxalate and also gets it from food sources. Vitamin C changes to oxalate when your body processes it.
When you consume foods containing oxalate, the compound attaches itself to minerals to make other minerals. These include iron oxalate and calcium oxalate. The process happens in the colon most of the time and sometimes in the kidneys.
The body then removes the elements through stool or urine. For people with high levels of sensitivity, diets high in oxalates can cause kidney stones. They also increase their risk of other health problems.
WebMd
End of Wednesday.
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12/16 – Thursday Homework: –
Period 2 class – Do not complete Lab 15 – we work on it tomorrow in class.
1. Please complete the following worksheets that we started in class and review their keys:
I may collect something tomorrow.
If you need help with these concepts from the worksheets below please view the posted class lectures from today and yesterday. They really focus on these basic skills.
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12/17 – Friday – B Day – 2, 3b/4 Lab
a) To complete Lab 15 – Redox Volumetric Titration.
b) To Review more complex Redox reactions and applications.
1. Complete the calculations of Lab 15.
2. Review Redox reactions/Demo:
a) Reactivity of metals demo video —> Penny Demo.
b) Tarnished Silver Tray
c) Underwater Fireworks
Period 3/4:
1. Start and Complete Lab 15.
2. Review Redox reactions/Demo:
a) Reactivity of metals demo video —> Penny Demo.
b) Tarnished Silver Tray
c) Underwater Fireworks
Reactivity series Lab – Acid added to metals (the action of acid is actually a redox reaction):
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Lab 15 – The Determination of the Concentration Oxalic Acid by a Volumetric Redox Titration
When oxalic acid mixes with other minerals, it forms oxalate. People regularly use the two terms interchangeably to refer to the same thing. Your body produces oxalate and also gets it from food sources. Vitamin C changes to oxalate when your body processes it.
When you consume foods containing oxalate, the compound attaches itself to minerals to make other minerals. These include iron oxalate and calcium oxalate. The process happens in the colon most of the time and sometimes in the kidneys.
The body then removes the elements through stool or urine. For people with high levels of sensitivity, diets high in oxalates can cause kidney stones. They also increase their risk of other health problems.
WebMd
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12/17 – Friday Homework: –
3. Complete the form.
End of Thursday….
Spectrophotometry Presentation that was in the lecture:
End of week 5!