MORGAN Titration Of The Acetic Acid In Vinegar Chemistry Lab 5 Report

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EXPERIMENT #5: Titration of the Acetic Acid in Vinegar
General Chemistry Laboratory, Spencer Hall 207
Morgan State University, Baltimore, MD
March 21, 2019. 8:00 a.m. – 10:50 a.m
Title: Titration of the Acetic Acid in Vinegar
Abstract:
Introduction:
Experimental details
Objective
-To titrate vinegar using a standard NaOH solution.
-Determine the concentration in both the methods of preparation that are used.
Materials
-Electronic balance
-1 Beaker (450ml)
-Cleaning solution
-Cleaning brush
-Lab coat/ apron
-Safety goggles
-Standard NaOH solution
-50 mL Buret
– 10 mL Volumetric pipet
– 100 mL Volumetric flask
-Buret Clamp and stand
– Vinegar
– Phenolphthalein
– NaOH (solid)
Experiment :
Procedures: (Liquid) Method #2 Dissolution of the solute WK#1
-Using a cleaning solution, ali appartus was throughly cleaned. (Volumetric flasks, beaker,
pipet)
-All equipment was dried using papaertowels.
-150mL of the liquid solution was transferred to a beaker
-Next, the volume of the solution is calculated.
M1V1=M2V2
M1 = 0.98M
M2=0.40M
V1= ?
V2=100mL (DILUTED)
M2=(0.40M) V2 (100ML)
=40m/mL
m1(0.98) V1= 40 m/mL
-This is to calculate the mass and volume of the solution(stock)
m1(0.98) v1(41mL)= 40m/mL
-Next, a 50mL erlenmeyer flask was filled with 41mL of the stock solution.
-41mL of the stock solution was transferred into a volumetric flask using a pipet.
-Next, the liquid solution is dilutled using distilled water, from 41mL, to the v2 value of
100mL (59ml distilled water)
-A cap is now placed on the volumetric flask, and it is shaken to mix throughly.
-Next, a pinch of the solution is added to the buret to coat the inside, then it is shoved around
to evenly cover it.
It was then poured out of the buret.
-Afterwards, 50mL the stock solution is added to the buret.
-10ml of vinegar was then poured into a 50mL.
-After that 2 drops of phenolphthalein was added to each erlenmeyer flask.
-The 10mL of vinegar was transferred to an erlenmeyer flask afterwards.
(3) Each flask contains: -10ml distilled water, 10mL vinegar and 2 drops of phenolphthalein
-Next, the stock solution is added to each flask containing the mixture. A purple color was
produced, then faded away upon mixing.
-After multiple insertions of the stock solution, the solution turned a pale-purple tint 18 mL
was added in the flask before permanent color change.
Procedures: (Solid) Method #1 Dissolution of the solute WK#2
-50mL beaker was filled with 25mL cleaning solution
-All apparatus were cleaned using solution, distilled water , and a cleaning brush, then
distilled dried with paper towels.
-First, the amount of the solute (NaOH) needed was calculated
0.4 moles x 0.1
=0.04 x 39.77g
=1.59g
-This concluded that 1.59g of the solute was needed; Three samples of 1.59g of NaOH was
weighted of an electronic balance.
-Next, the solid NaOH was added to a volumetric flask, then 2 drops of distilled water was
added to the flask to dissolve the solute.
-The volumetric flask containing NaOH was filled to 100mL with distilled water; this was
repeated twice for 3 trials with 3 different volumetric flasks, NaOH samples, and distilled
H20.
-The flask was then mixed using a lid, then transferred into a 50mL Biunet.
-In 3 different erlenmeyer flasks, 10mL of vinegar , 10 mL of distilled water, and 2 drops of
phenolphthalein was prepared.
Results and Calculations:
Table #1 containing the Results
CH3COOH + NaOH → CH3COONa + H2OCH3COOH+NaOH→CH3COONa+H2O
WEEK 1 METHOD 2
Flasks
Burnet Trants
Volume
Titrant Volume (Bunet)
Final
Used
Trial #1
50 mL
32 mL
18 mL
Trial #2
32 mL
15 mL
17 mL
Trial #3
43 mL
28 mL
15 mL
Flask Intial
1. 20 mL
2. 20 mL
3. 20 mL
Flask Final (Used ) (+20 mL)
38 mL
37 mL
35 mL
WEEK 2 METHOD 1
Flask
Titrant vol
Final
Used
Initial
Final
Trial 1
52mL
33mL
18mL
20mL
38mL
Trial 2
33mL
10mL
23mL
20mL
43mL
Trial 3
31mL
10mL
21mL
20mL
41mL
Flask #1
38 mL – 20mL
=18 mL NaOH
=0.08L NaOH
CH 3 CooH ⇒ CH 3 CooNa +H20 (1=0) Balanced raio
n=MV
0.4 mol NaOH x 0.018
=0.0072 mol NaOH
1 mol NaOH = 1 mol CH3CooH
0.0072 NaOH
0.0072 mol NaOH x 1 mol CH3CooH =0.0072 mol CH3CooH
1 mol NaOH
10ml H20 + 10 mL Vinegar = 20 mL ⇒ Pink = 6.8 mL NaOH (Biuret)
Flask #1 (10 mL)
Flask pt.2 (20mL)
ConC = 0.0072 mL CH3 CooH
of
0.01L
ConC = 0.0072 mL CH3 CooH
of
0.01L
Flask Pt. 3 (Turns Pink)
(30)mL
ConC = 0.0072 mL
of
0.038 L
CH3 CooH
=0.72 M CH 3CooH
=0.36M CH3CooH
=0.189 M CH3CooH
Mass of CH3 CooH
M=moles x MW
Mass of Vinegar Density of vinegar g/mL
Mass of CH3CooH used x 100
mass of vinegar
0.432 g x 100= 4.32%
10g
Molecular weight of Acetic Acid calculations
C= 12.04 x 2 = 24.022
H= 1.00794 x 4 = 4.03176
O= 15.9994 x 2 = 31.9988
Mass of CH3C00H Used
60.05g/mol x 0.0072 mol
=0.432g Ch3CooH
Density of vinegar 1g/mL
D=m/v
M=D x v
M= 1g/ml x 10 ml
=10g vinegar
Flask #2
37mL – 20mL
=17mL NaOH
=0.017L NaOH
CH3CooH ⇒ CH3CooNa +H20 (1:1) Balanced Ratio
n=MV
0.4mol NaOH x 0.017L
=0.0068mol NaOH
1mol NaOH = 1mol CH3CooH
0.0068 mol NaOH x 1mol CH3CooH = 0.0068 mol CH3CooH
1 mol NaOH
10mL H20 + 10mL Vinegar = 20mL ⇒Pink =6.8mL nAoh (Buret)
Flask #2 pt.1 (10mL)
Flask #2 pt. 2 (20mL)
ConC = 0.0068 mL CH3 CooH
of
0.01L
ConC = 0.0068 mL CH3 CooH
of
0.02L
=0.68 M CH 3CooH
=0.34 M CH 3CooH
Flask #2 pt.3 (37mL)
0.0068 mol CH3CooH
0.038L
=0.184 M CH3CooH
Mass of CH3CooH
m=moles x MV
0.0072 x g
Mass of vinegar
Density of vinegar g/mL
Mass of CHC00H Used
60.05g/mol x 0.0068 mol
= 0.408g CH3CooH
M=1g/mL X 10mL =10g Vinegar
0.408 x100 = 4.081
10g
Flask #1 Relative error
True Value of CH3CooH =5%
[4.32-5] = (-0.38) x 100 =136 %
5
5
4.32 + 4.08 + 3.6 = 12 / 3 = 4%
Method #2 (Liquid) Dilution From stock solution
4 – 5 = (1) x 100 = 20%
5
5
Method #1 (Solid) Dilution From stock
4.96- 5 = (-0.04) x 100 = 0.8%
5
5
Flask #1 (Method 1, Wk 2)
38 mL- 20mL
=18mL NaOH
=0.018L NaOH
N=MV
0.4mol NaOH x 0.018L
=0.0072mol NaOH
1mol NaOH = 1 Mol CH3CooH
0.0072 mol NaOH x 1 mol CH3CooH = 0.0072 mol CH3CooH
1 mol NaOH
10mL H20 + 10mL vinegar = 20mL⇒ PINK = 7.2 mL NaOH (Burnet)
Flask #1 (Method 1, wk 2) (10ml)
Flask #2 (20ml)
ConC = 0.0072 mL CH3 CooH
of
0.01L
ConC = 0.0072 moL CH3 CooH
of
0.02L
=0.72 M CH 3CooH
=0.36 M CH 3CooH
Flask #1 (pt.3) (38mL)
Mass of CH3CooH
M= moles x MW
ConC = 0.0072 moL CH3 CooH
of
0.038L
60.05 g/mol x 0.0072 mol
=0.432 CHCooH
=0.189 M CH 3CooH
M=1g/ml x 10 ml
=10g Vinegar
0.432 x 100 = 4.32 %
10g
Flask #3 (Method 1, Wk #2)
41mL -20mL
=21mL NaOH
=0.021L NaOH
N=MV
0.4mol NaOH x 0.021L
=0.0084mol NaOH
1mol NaOH = 1 Mol CH3CooH
0.0084 mol NaOH x 1 mol CH3CooH = 0.0084 mol CH3CooH
1 mol NaOH
10mL H20 + 10mL vinegar = 20mL⇒ PINK = 8.4 mL NaOH (Burnet)
Flask #3 (PT. 1) (10ml)
Flask #3 PT.2 (20ml)
ConC = 0.0084 mL CH3 CooH
of
0.01L
ConC = 0.0084 moL CH3 CooH
of
0.02L
=0.84 M CH 3CooH
=0.42 M CH 3CooH
Flask #1 (pt.3) (41mL)
Mass of CH3CooH
M= moles x MW
ConC = 0.0084 moL CH3 CooH
of
0.041L
60.05 g/mol x 0.0084 mol
=0.504 CHCooH
=0.184 M CH 3CooH
M=1g/ml x 10 ml
=10g Vinegar
0.504 x 100 = 5.04 .” %
10g
Discussion:
.
Conclusion:
References:
General Chemistry Laboratory Manual, An integrated Critical Thinking Approach, By Angela J
Winstead, Morgan State University, McGraw Hill 2013.
65%.
LON
ای
13|16_2019 semester
CHEM 105L/CHEM 106L LABORATORY REPORTGRADING RUBRIC
David
4 4
Experiment #
Student:
Score
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(0)
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ABSTRACT
Beginning
(2)
Abstract correctly
describes the:
– experimental
technique(s) used (brief,
with no in-depth
description of steps)
– results of experiment
Developing
(3)
Abstract correctly describes
the:
– key question
– experimental technique(s)
used (brief, with no
description of steps
– results of experiment

3
por Satisfactory
(4)
Abstract correctly describes
the:
– main goal/purpose
– key question
– experimental technique(s)
used (brief, with no in-depth
description of steps)
– results of experiment –
conclusions
Introduction correctly
describes the:
– main goal/purpose
– key question(s) experiment
is trying to answer
– key concepts or theories
Missing
INTRODUCTION
Introduction correctly
describes the:
– main goal/purpose
Accomplished
(5)
Abstract correctly describes the:
– main goal/purpose
– hypothesis or theory
– key question
– experimental technique(s) used
(brief, with no in-depth
description of steps)
– results of experiment
– conclusions
Introduction correctly describes
the:
– main goal/purpose
– key concepts or theories in
relationship to experiment
– key question(s) experiment is
trying to answer
Experimental correctly
describes:
– all procedures performed in
the experiment in paragraph
form with enough detail that
it can be replicated
– techniques used in the
experiment
Introduction correctly
describes the:
– main goal/purpose
key question(s) experiment
is trying to answer
3
Definitions
& relate to
DUE
experiment
Missing
EXPERIMENTAL
Experimental correctly
describes the:
– some procedures
performed in the
experiment in list form
AND/OR
– some techniques
used in the experiment
B
4
form 9525
Experimental correctly Experimental correctly
describes: susila
describes:
– some procedures
– most procedures
performed in the caso performed in the
experiment in paragraph experiment in paragraph
form with enough detail
– techniques used in the
that it can be replicated
experiment
– techniques used in the
20
experiment
Some instrumentation used Most instrumentation used
in the laboratory is described:
in the laboratory is
– with a ChemSketch drawing described:
– with a ChemSketch
drawing
– proper labeling
Most results presented with:
All results presented with:
22
D
Missing
All instrumentation used in the
laboratory is described:
– with a ChemSketch drawing
– proper labeling
INSTRUMENTATION
– proper labeling
Some instrumentation
used in the laboratory is
described:
– with a non ChemSketch
drawing AND/OR
– proper labeling
Some results presented
2
ure

All results presented with:
Missing
RESULTS
purpose
-sults obtained
–suon(s) of
-urlent – answers all analysis
questions
unclusions correctly
summarizes:
– main goal/purpose
– major results obtained
– how the result
Missing
Conclusions correctly
summarizes:
Meaning is not al
and
thai
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graphs/flowcharts/tables/figures
with numbered titles and
descriptions (Example: Figure 1.
ChemSketch drawing of a beaker)
– sample calculations used in the
experiments
D
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with:
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graphs/flowcharts/tables
graphs/flowcharts/tables/ /figures with numbered
figures
figure titles with descriptions
WO
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(Example: Figure 1.
ChemSketch drawing of a
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02ESS
sample calculations used in
the experiments
Discussion correctly Discussion correctly describes
describes the:
the:
– meaning of results – meaning of results obtained
obtained
– provides error analysis
subur LOL and/or describes places
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where might have occurred in
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the experimente
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– answers some analysis
be collect
questions
Missing
DISCUSSION
Apply key
R
3
concepts
graphs/flowcharts/tables
/figures with numbered
figure titles with
descriptions (Example:
Figure 1. ChemSketch
drawing of a beaker)
– sample calculations used in
the experiments
Discussion correctly
describes the:
– meaning of results
obtained
– provides error analysis
and/or describes places
where might have occurred
in the experiment
– describes how results
obtained address the key
question(s) of experiment
answers most analysis
question
Conclusions correctly
summarizes:
main goal/purpose
– major results obtained
how the results addressed
the key question(s)
experiment is trying to
answer
neopuidmata)
Q
Discussion correctly describes
the: – meaning of results
obtained
– references specific datasets
during description
– provides error analysis and/or
describes places where might
have occurred in the experiment
– describes how results obtained
address the key question(s) of
experiment – answers all analysis
questions
SIGN
laus
EXCELLENCE
wraus
CONCLUSIONS
Missing
Conclusions correctly
summarizes:
– main goal/purpose
AND/OR -results obtained
Conclusions correctly
summarizes:
– main goal/purpose
– results obtained


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Conclusions correctly
summarizes:
– main goal/purpose
major results obtained
how the results addressed the
key question(s) experiment is
trying to answer
what could be changed to
improve results
Meaning is very clear with no
errors.
– Report is written in the third
person (Example: The beaker was
weighed using a balance.)
LANGUAGE
Missing
Avoid next
3
Meaning is clear with less
than 5 errors.
– Report is written in the
third person (Example: The
beaker was weighed using a
balance.) 25 CTO
afterwards
Meaning is not clear
and/or has more than 10
spelling and grammatical
errors.
– Report is written in the
first person (Example: My
team weighed the beaker
using a balance.)
for
us
Meaning is somewhat clear
and/or contains between 5-
10 errors.
– Report is written in the third
person (Example: The beaker
was weighed using a
balance.)
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52
Total Points=
P24

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