BTEC
Assignment front sheet
Assessor Name
Assessor name
Learner name
Lena Shipley
Date issued
Completion date
09/10/14
06/11/14
Submitted on
Qualification
Unit number and title
BTEC L3 Extended Diploma Applied Science
Unit 4: Scientific Practical techniques
Assignment title
A2: Preparation, purification and yield of
chemical compounds
In this assessment you will have opportunities to provide evidence against the following criteria.
Where appropriate: Indicate the page numbers where the evidence can be found.
Criteria
reference
To achieve the criteria the evidence must show that
the learner is able to:
Task
no.
P2
Demonstrate use of scientific techniques to separate substances
P3
Estimate the purity of samples using scientific techniques
M2
Describe the factors that influence purity
D2
Evaluate the accuracy of the methods used to estimate the purity
of the samples
Page numbers
1
2
3
4
Notice to Learner
The work you submit for assessment must be your own. You may be disqualified from at least the subject concerned if you copy
from someone else, allow another learner to copy from you, or if you plagiarise in any way.
I have read and understood the Notice to Learner above. I have produced the attached work without assistance, other than which my teacher has
explained is acceptable within the specification.
Learner signature:
Date:
Declaration by centre- Assessor
I confirm that the learner’s work was conducted under the conditions laid out by the specification. I have authenticated the learner’s work and am
satisfied that to the best of my knowledge the work produced is solely that of the learner.
from someone else, allow another candidate to copy from you, or if you cheat in any other way.
Signed (Centre-Assessor)
Date
Learner declaration
1
Name ( Block capitals)
Assessor's comments – Feed back to learner.
BTEC L3 Extended Diploma
Qualification
Applied Science
Unit 4: Scientific Practical
Unit number and title
techniques
Assessor
name
Learner
name
Lena Shipley
Grade
achieved?
Grading criteria
P2 Demonstrate use of scientific techniques to separate substances
P3 Estimate the purity of samples using scientific techniques
M2 Describe the factors that influence purity
D2 Evaluate the accuracy of the methods used to estimate the purity of the samples
Assessor feedback
Action plan
Learner feedback
Assessor signature
Date
Learner signature
Date
2
STUDENT INSTRUCTIONS
1.
Read the assignment carefully and ask the lecturer to explain any sections you don't
understand.
2.
Attempt all the tasks listed in the assignment.
3
The information you require to complete this assignment may be researched at the
college library, flexible learning centre or from your work place etc. Remember the
contents of this assignment must reflect your efforts in researching the information
required. Its contents should be yours alone and not the efforts of others unless
group work has been specified.
4.
When you have completed the assignment collate the pages and number them in the
correct order. Detach the front cover from this script and attach it as the front cover
of your assignment. Detach the marking sheet from this script and attach as your
last page. Staple all the pages of your assignment at the top left-hand corner. Do
not forget to put your name on your assignment.
DO NOT PUT THE INDIVIDUAL PAGES INTO PLASTIC POCKETS. HOWEVER,
PLEASE INSERT THE WHOLE ASSIGNMENT INTO ONE PLASTIC POCKET.
5.
Deadlines and time constraints are important both in the workplace as well as in
college therefore you should make every effort to hand in the assignment at the
agreed time. If work is handed in after the deadline you may only be given the
chance to rework your assignment to achieve the pass criteria.
If you are unable to meet a deadline, staff should be notified in good
time, not when the assignment is due in.
3
Scenario
In the science industry many different compounds are made for many different uses,
e.g. analgesics for the pharmaceutical industry. Once the compounds are made any
unused reactants and impurities must be removed for quality control purposes. This
can be done by employing a variety of separation techniques. Compounds must also be
made in an economical way so it is also important to maximize the yield whilst
controlling the costs.
For this assignment you will demonstrate the use of chemical separation techniques,
prepare products using these techniques, purify your products and measure the yield
and purity.
Task 1
You have used several separation techniques during practical sessions. Ensure that you
have records in your lab book recording the techniques used and any observations
made. The techniques used should include decanting, filtration, use of centrifuge,
distillation, paper chromatography.
Part of P2
Task 2
Using the method shown on the following pages, and following health and safety
procedures identified in the risk assessments, prepare a sample of aspirin and purify
using the techniques described. Record your work in your lab book .
Part of P2
Estimate the purity of your product by carrying out chemical tests, measuring the
melting point and using thin layer chromatography. Record your results in your lab
book.
Part of P3
Task 3
Write a formal laboratory report on the micro synthesis of aspirin using an accepted
format for scientific reports. Include a detailed method, results and clear conclusion.
Describe the factors that influence purity. In your discussion section of your report
identify what parts of the practical procedure carried out could affect the purity of your
product and how you could improve the purity next time.
M2
4
Task 4
Evaluate the accuracy of the methods you have used to estimate the purity of your
products when you made aspirin. Which of the methods used do you think is more
accurate and why?
D2
Hand in a write up of your experimental procedure with brief methods, showing your
results and all calculations in full. You should include a separate section at the end to
cover task 3- this must be clearly headed Task 4.
5