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- PEARSON (PEARSON)
Exam of 6 pages for the course Unit 5 - Principles and Applications of Science at PEARSON (Aim D , ASIGNMENT 2)
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BTEC Assignment BriefPearson BTEC Level 3 National Certificate in Applied Science
Pearson BTEC Level 3 National Extended Certificate in
Applied Science
Pearson BTEC Level 3 National Foundation Diploma in Applied
Qualification
Science
Pearson BTEC Level 3 National Diploma in Applied Science
Pearson BTEC Level 3 National Extended Diploma in Applied
Science
Unit number and title
Unit 2: Practical Scientific Procedures and Techniques
A: Undertake titration and colorimetry to determine the
Learning aim(s) (For NQF
concentration of solutions.
only)
Concentrate on keeping up your standards
Assignment title
Assessor
Zahida Imtiaz
11/01/2022 for group 1
Issue date
14/01/2022 for group 2
25/01/2022 for group 1
Hand in deadline 28/01/2022 for group 2
You are a newly appointed technical assistant at a large
chemical plant, Chemcalequip. As part of your induction
period and to progress in your role, you have to demonstrate
skills in a range of practical procedures and techniques. Part
of your role is to ensure equipment is calibrated and
equipment and chemicals are safety checked.
Vocational Scenario or A key part of your job will be making and testing standard
Context solutions using titration and colorimetry procedures. You
must demonstrate your ability to carry out these techniques
skilfully and accurately.
Evidence of your practical skills, along with your results,
calculations, evaluation of the techniques and possible
improvements will need to be submitted in a report(s).
Evaluate the accuracy and safety of the following
quantitative procedures and techniques in relation to
their outcomes.
Your practical work must be undertaken correctly and safely
Task 1
at all times.
Your techniques will need to be performed to a high degree
of accuracy and precision in order to obtain reliable and valid
outcomes.
You will be observed performing your preparation of
, solutions, calibration of equipment and application of titration
and colorimetry techniques.
Titration:
● You will perform different titrations to accurately and
skilfully determine the concentration of a solution of
sodium hydroxide.
● You will first need to calibrate the equipment that you will
use for these titrations which will include: the pipette, the
weighing balance and the pH meter (using buffer
solutions).
● Your practical work will involve three stages:
o Preparation of a primary standard solution of Na2CO3
by weighing the solid, using the calibrated weighing
balance, mixing and dissolving in water, and making
up the solution to an accurate volume
o Accurate standardisation of a given concentration of
hydrochloric acid (HCl) by titration with your primary
standard solution of Na2CO3 and using the calibrated
pipette
o Titration of the sodium hydroxide (NaOH) solution of
unknown concentration with the standardised HCl
● You must use two different titration techniques in your
determination of the concentration of sodium hydroxide
(NaOH):
o by use of an appropriate indicator to determine the
end point
o by use of the calibrated pH meter to monitor the pH
change before, during and after the end point
● You must produce accurate, precise and reliable results
from both techniques
● You must calculate the concentration of NaOH solution:
o directly from your recorded results, in the titration
technique using the indicator
o by plotting and using a graph of pH against volume
of HCl, in the titration technique using the pH meter
Colorimetry:
● You will use a colorimeter (or visible spectrometer) to
accurately and skilfully determine the concentrations of
Sample A and B, which are two different concentrations
of copper(II) sulfate (CuSO4) solution that you will be
provided with.
● Your practical work will involve:
o Preparing your own known concentration of CuSO4
solution by weighing hydrated copper(II) sulfate solid
(CuSO4.5H2O), dissolving in water and making up to
an accurate volume
o Accurately dilute your stock CuSO4 solution to
produce a series of CuSO4 standard solutions of
different concentrations
o Select an appropriate filter / wavelength for the
2
BTEC Assignment Brief v3.0
BTEC Internal Assessment QDAM December 2017
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