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BTEC Applied Science Unit 2 Assignment A
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Unit 2: Practical Scientific Procedures & TechniquesUndertake titration to determine the concentration of solutions.
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BY: Ajmal Shekeb NOORMAL
1
,Assignment 2A Ajmal Shekeb NOORMAL
Titration 2
, Assignment 2A Ajmal Shekeb NOORMAL
Introduction
I am a newly appointed technical assistant at a large chemical plant. As part of my induction
period and to progress in my role, I have to demonstrate skills in a range of practical procedures
and techniques. Part of my role is to ensure equipment is calibrated and equipment and
chemicals are safety checked.
The key part of my job will be making and testing standard solutions using colorimetry and
titration. I have to demonstrate my ability to carry out these techniques. I will need to submit
in a report, The Evidence of my practical skills, along with my results, calculations, evaluation of
the techniques and possible improvements.
My task is to find the concentration of unknown substances from the substances with a known
concentration using titration. I will use calibration for equipment to give me more accurate result
for my experiment
Calibration of instruments: calibration of a scientific instrument helps to maintain the accuracy
of that instrument. The process involves using the instrument with known values. This makes the
instrument to produce results that are more accurate.
Titration: is an analytical technique whereby the concentration of an unknown solution is
determined by using a standard solution. A titration is a procedure used to identify the
concentration of a solution by reacting it with a solution of known concentration and measuring
the volume required for a complete reaction. The number of moles in the standard solution is
calculated using a balanced equation for the reaction, the number of moles in the solution of
unknown concentration can also be calculated, once the number of moles for the solution is
known, the concentration can be easily calculated.
The concentration of a solution is a measure of how much solute is dissolved per unit of solvent.
The formula for concentration is: - Amount of solute/Volume of solvent (C = n/v).
Amount of solute is measured in moles. (n= number of moles or amount of solute)
Volume of solvent is measured in dm³. (V= volume of solvent)
Concentration is measured in mol/dm³. (C= concentration)
Volume is often expressed in cm³, so a more useful equation includes a conversion from cm³ to
dm³. (1dm³=1000cm³)
A standard solution is a solution of known concentrations. Standard solutions are made by
dissolving an accurately weighed mass of solvent in a known volume of solvent using volumetric
flask. The volumetric flask has a thin Rack which is marked with a line so it can be filled accurately
to the correct capacity. Standardization is the process of determining the exact concentration
(molarity) of a solution.
The standard solution can then be used to find the concentration of a second solution, with
which it reacts. This is known as volumetric analysis or titration.
Titration 3
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