SCH4U h5+, Chemistry, 12, University ­ Virtual High School Unit Assignment: Acid­ Base Titration Lab Assignment Request the complete assignment now.

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SCH4U h5, Chemistry, 12, University Virtual High School
Unit Assignment: Acid-Base Titration Lab Assignment
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Purpose:
To determine the molar concentration of a base
by performing a
titration using an acid of known volume and
concentration.
Procedure
1. For each acidbase system to be tested, create
a data table
that includes the volume of acid in the
Erlenmeyer flask, the
final buret reading, the initial buret reading, the
volume of
base used in titration in the first column.
2. Select the Type of Reaction (i.e. strong acid vs
strong
base).
3. Choose to fill the burette with a base.
4. Select the species of acid and base to be used
in the lab.
Lab Report
Acid Base Titration
Theory:
The unknown concentration of the acid/base can be found out by
titrating it with the base/acid of the known concentration. Preferably the
base is filled with the burette, since acid cause burns if mis handled.
Materials Needed:
• 25ml of 0.2056M hydrochloric acid
• 50ml of sodium hydroxide (any concentration)
• 25ml of 0.1242M acetic acid
• 50ml of potassium hydroxide (any concentration)
• 10ml Phenolphthalein which will act as an indicator, this is an important
material which helps to identify the end of titration by changing one of its
properties like colour
• Burette, to hold the base
• Flask , for acid

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5. Select the indicator to be used. If you are
unsure which
indicator to use, research the uses of both
methyl orange
and phenolphthalein to help you decide.
6. Record the molar concentration and volume of
acid in the Erlenmeyer flask.
7. For larger amounts, use the slider to add base
from the
buret to the Erlenmeyer flask. As you approach
the
endpoint, the solution will show a brief colour
change to
pink that will disappear. This is the point at which
you can
change to adding base drop wise using the
button below
the slider.
8. Record the volume of based used to titrate the
sample of
acid to the endpoint.
9. Repeat steps # 2 8 using a weak acid vs. a
strong base
Procedure:
1. For each acid-base system to be tested, create a data table
that includes the volume of acid in the Erlenmeyer flask, the
final burette reading, the initial burette reading, the volume of
base used in titration in the first column.
2. Select the Type of Reaction (i.e. strong acid vs strong base).
3. Choose to fill the burette with a base.
4. Select the species of acid and base to be used in the lab.
5. Select the indicator to be used. If you are unsure which
indicator to use, research the uses of both methyl orange and
phenolphthalein to help you decide.
6. Record the molar concentration and volume of acid in the
Erlenmeyer flask.
7. For larger amounts, use the slider to add base from the
burette to the Erlenmeyer flask. As you approach the endpoint,
the solution will show a brief colour change to pink that will
disappear. This is the point at which you can change to adding
base drop wise using the button below the slider.
8. Record the volume of based used to titrate the sample of
acid to the endpoint.
9. Repeat steps # 2 - 8 using a weak acid vs. a strong base.

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Communicate the results in a lab report. Refer to
the "Writing a Lab Report"
page of the Scientific Skills and Formatting
module to ensure that you follow
the proper format.
Be sure to include your calculations for
determining the molar concentration of
both the strong and weak acids used in the
titration. Also discuss any
comparisons you can make between the two
types of systems.
.
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Note on Writing In Science
All information and relevant data are to be
included in a logically sequenced
manner. In your writing, it is important to use
appropriate writing style, tone, and
scientific terminology. Conduct your research
using reliable, peer revewied and
industry sources and ensure that sources listed in
your reference list are directly
related to information presented in your paper.
Use the appropriate referencing
style for science to cite your sources. For more
information, see the page titled
“References” in the Scientific Skills and
Formatting module of the
Introduction unit in your course
.
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