7.
Using burettes, titrate the solution in the flask with the
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acid solution to be standardized.
8.
Repeat the titration procedures at least two more times,
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for each titration, calculate the normality (to four decimal
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places) of the acid solution by using the following formula:
N
=
(DEP) (weight of primary standard)
(ml of acid) (MEW primary Standard)
9.
Obtain the average value of the acid's normality and label
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the standardized solution for future identification.
If any
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solution differs from the mean by +/-0.0005 N repeat the
titration process.
Ensure the accuracy of the weights by using the proper balance.
There are four basic types of balances found in the petroleum
laboratory:
1.
The
Analytical
2.
The
Harvard Trip
3.
The
Torsion
4.
The
Triple Beam.
Each balance is geared toward a specific level of precision.
You must determine the type of balance to be used in each
situation.
Also you must be able to train the technicians to
choose the proper balance, based on the scope of the operation.
A description of the different types of balances can be found in
FM 10-67-2, Chapter 7, Section III.
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You will need to monitor the process to determine if the
technicians are using the appropriate standards.
You should
verify that the correct methods are applied to the preparation
of the solution. The above guideline will help you to chart as
well as audit the overall process.
Once the solution is made,
the necessary steps must be taken to standardize it.
Make a
note of the amount of solution that was used in the titration
process.
Double-check the calculations used to determine the
normality of the solution.
Discuss the process with the
technicians and show them how to correct any mistakes they may
have made.
At the same time, allow technicians that show
proficiency to help others.
Make sure that all results are
correct and recorded to the fourth decimal place.
Finally,
verify
that
the
technicians
have
labeled
the
standardized solution properly.
Failure to properly label
3-6
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