Freezing point temperature for Acetic Acid and Acetylsalicylic Acid Lab Report

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Hi I have a lab report. the procedure was not given by the instructions/ instructor, so we I used an old procedure ( we had an option to make a research and find the procedure, but I used of of the last lab's procedure). you can look up a procedure for this lab. please follow all the striations provided below.

Freezing point temperature for Acetic Acid and Acetylsalicylic Acid Lab Report
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Freezing point temperature for Acetic Acid and Acetylsalicylic Acid Lab Report
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Freezing point temperature for Acetic Acid and Acetylsalicylic Acid Lab Report
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Freezing point temperature for Acetic Acid and Acetylsalicylic Acid Lab Report
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Group Project #1 Equipment: ➢ 4” Disposable test tubes, Styrofoam cups, plastic gloves (supplied in lab) ➢ Thermistor and thermometer ➢ Beakers (from your locker) Reagents: ➢ Glacial (pure) acetic acid as solvent ➢ Acetylsalicylic Acid and Glycerin as solute In a previous experiment you used cooling curves to determine the freezing points, and then used this data to determine the van’t Hoff factor for a series of salts in water. In this project, you will use the same experimental technique to measure the freezing point of pure (glacial) acetic acid as your solvent, and then several solutions of acetylsalicylic acid dissolved in glacial acetic acid. For this experiment, you will use ~2 mL of glacial acetic acid as the solvent for each trial. There will need to be 3 solutions made with acetylsalicylic acid as the solute using ~0.05g, 0.10g, and 0.15g. Two trials for each solution will need to be performed to get an average ∆Tf for each solute amount. In addition, one solution with glycerin as the solute will be made to make a comparison between solutes. Use ten drops of glycerin as the solute. Using your data, you will calculate an experimental value for the freezing point constant (Kf) for acetic acid. Because both acetylsalicylic acid and glycerin are molecular compounds, their ivalues are 1. Acetylsalicylic acid, C9H8O4, is the active ingredient in aspirin. Glycerin, C3H8O3, is frequently found in soaps, as a sweetener, or in pharmaceutical applications. You will need to calculate the molar mass of acetylsalicylic acid and glycerin from their formulas before you can determine Kf for acetic acid from you freezing point data. Pure acetic acid is corrosive and should be handled with care. Reviewing the previous experiment will help you plan and carry out experimental procedures, computer programs, calculations, etc. Compare the results of the Kf calculations for the two solvents. Note that everything that comes in contact with the acetic acid solutions must be clean and dry. ...
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Tutor Answer

dynamic_tutor
School: University of Maryland

Hi, I am sending you the draft version.I am waiting for your comments :)

DETERMINATION OF FREEZEG POINT OF ACETIC ACID, GLYCERIN AND ACETYLSALICILIC
ACID
Xxx
xxx
**/**/18
INTRODUCTION:

In the presented study the evaluation of freezing points of glacial acetic acid (HAc) as well as several
solutions of acetylsalicylic acid dissolved in glacial acetic acid was carried out. Additionally, one sample
of glycerin dissolved in glacial acetic acid was also tested. The analysis was carried out in two repetitions
in order to check the repeatability of the results. The solutions of acetylsalicylic acid dissolved in acetic
acid were prepared by dissolving the following amounts of acetylsalicylic acid ~0.05 g, ~0.10 g, ~0.15 g
into ~2 mL of acetic acid. This result will show how the freezing points, as well as freezing points
constant (Kf) change with the addition of solute into the solvent.

PROCEDURES AND OBSERVATIONS:
In order to determine freezing point of the selected solvent and solutions, different amounts of
acetylsalicylic acid were measured. Namely, ~ 0.05 g, ~ 0.10 g, ~ 0.15 g of previously mentioned acid was
measured in test tube. Then, in each test tube, 2.042 g (about 2 mL) of HAc was measured. Aslo, 4 g of
glycerin was measured in a separate test tube. The freezing point was determined following the procedure
described earlier1. The obtained results were used for Kf value determination.
Briefly, in the 8 inch test tube equipped with thermometer bulb 10 mL of adequate solvent (HAc) or
solution (glycerin or acetylsalicylic acid as a solute and HAc as a solvent) was added. The aperture was
placed in the cold water. During the process of cooling the solution was stirred until the formulation of
solid. Then, the solid mixture was removed from the cold water and the temperature had been followed for
some period in order to detect when the temperature does not change anymore. At that time the solution
reached the freezing point.

DATA
In table 1 are given the data obtained in this experiment. Also, the molar masses of glacial acetic acid
(C2H4O2), acetylsalicylic acid (C9H8O4) and glycerin (C3H8O3) were 60.052, 180.16, 92.09 g/mol,
respectively.

1

Table 1. The results obtained during the pKa determination for an unknown weak acid
Trial

Solution

1
1
1
2
2
2

1
2
3
1
2
3

Mass of
the test
tube +
HAc,
(g)
4.214
4.214
4.214
4.214
4.214
4.214
4.214

Mass of mass of
test tube HAc ,
+ HAc,
(g)
(g)
6.256
6.256
6.256
6.256
6.256
6.256
6.256

2.042
2.042
2.042
2.042
2.042
2.042
2.042

Mass of
aspirin,
(g)

No of
moles
aspirin,
(mol

TF
(°C)

mM,
(mol/kg)

Δ TF
(°C)

Kf,
(°C/ mM)

0.052
0.115
0.148
0.05
0.106
0.152

0.00028
0.00064
0.00082
0,00028
0.00058
0.00084

16.719
12.1...

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Review

Anonymous
awesome work thanks

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