Unit 2- Practical Scientific Procedures and Techniques
Institution
PEARSON (PEARSON)
Distinction grade 2D assignment, includes all the relevant information for pass, merit and distinction. Use this as a template for your own assignment and to learn the key points you should make in your own to get a distinction first try.
Unit 2- Practical Scientific Procedures and Techniques
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Titrations and colourimetry
I learned how to calculate the concentration of an unknown material through titrations. Titration is a
delicate analytical technique that enables you to introduce a chemical with a known concentration
or another chemical to ascertain an unknown concentration of that chemical in solution.
Some of the most frequent errors that might occur during titration trials include the following:
misreading of the endpoint (the reaction between the two solutions must stop for a titration to be
considered complete), Misreading the volume, concentration errors, improper instrument use, and
other human or equipment faults are all examples of titration errors. human error includes selecting
the wrong reagents or using the incorrect amount of indicator and other chemicals. Equipment
malfunction typically happens in the burette, which might eventually generate leaks. The results of
the titration will be affected by even a small fluid loss. If I practice this technique more, I will be able
to develop my abilities, my mistakes ought to be decreased and I should produce more trustworthy,
accurate outcomes.
Another ability I have developed is the ability to precisely determine unknown substance
concentrations using two different methods: titration and colorimetry. I am confident that I can do
this task successfully by adhering to each of their methods, using the proper formulas and equations,
and rearranging them to determine each of the unknown concentrations of a particular substance.
As I would know how to rearrange and set up the formula to suit the thing I need to work out, this
skill can be applied to other studies where formulas and equations are required to work out
something.
In the future, when I enrol in higher education, such a university, knowing how to calculate an
unknown chemical concentration will be helpful. I will need these abilities in university because I will
be in a lab a lot, conducting several experiments that require me to calculate unknown
concentrations. When I start working, this might come in handy. I would like a job in medicine where
I might have to calculate unidentified concentrations of different drugs. Because it requires
calculations, this talent is very valuable. It does not have to calculate unknown concentrations as a
result. It will assist me in resolving more maths issues that require the same idea.
I used the tools carefully and according to the correct procedures for these techniques, making sure
the meniscus was in the proper place when using the scientific Pipette and burette, closely observing
the procedure to prevent any errors.
For experiments like colorimetry and titrations, I have also learnt how to precisely use scientific lab
tools like a scientific pipette, a burette, a PH metre, and a colorimeter. I can effectively use this kind
of equipment by first comprehending what it is used for and then adhering to the instructions for
how it operates. Other experiments that call for the use of specialised tools can benefit from this
ability. This is a useful ability to have because most of the tools are versatile and regularly used in lab
settings, which will help me in the future because I will be more prepared. I achieved my aim of
getting accurate findings by adhering to the suggested technique for this skill and making sure that I
handled the equipment properly and correctly.
My second laboratory skill I have learnt is calibrating scientific instruments like a PH metre, balance,
and pipette. I learned what calibration of equipment requires. It is transferable to other
investigations that call for the use of a pipette, PH metre, or weighing balance to calibrate them. I
calibrated and double-checked my work as per the procedure for this method. I also learnt how to
use pH buffers and a pH metre to detect the concentration of substances, as well as how to calibrate
a pH metre.
, The usage of pH metres is a little challenging and has several restrictions. Here are some typical pH
metre mistakes to watch out for are using a faulty electrode and not removing both caps. Examples
of inappropriate electrode storage include dry storage, wiping the electrode, storing it in water,
leaving electrodes dirty and contaminated, faulty calibration, not submerging the electrode, and
testing at the wrong temperature.
The likelihood, effects, and tolerances for accidents are all determined through risk assessments.
Both quantitative and qualitative results can be presented because of this approach. A thorough risk
management approach for minimising potential risk-related effects must include risk assessment. I
was using safe working practices and taking efforts to minimise the risk because adhering to the risk
assessment will prevent mishaps.
Completing a risk assessment is a crucial first step in preventing accidents, and I will take safety
precautions and work in a safe manner to minimise the risk. I learnt how to organise a risk
assessment by first identifying hazards, then outlining the potential risks they pose, and finally
outlining the steps that should be done to lower the risk. This is the accepted procedure for
performing risk assessments, and it will significantly increase the safety of my working procedures.
To ensure everyone's safety when executing the titration, it is essential to adhere to the risk
assessment; if something goes wrong, we should be ready to act immediately. If acid gets in the eye,
flush it for ten minutes with softly flowing tap water. if the discomfort persists you should go to the
doctor. if you ingest something acidic you should not do much more than rinse your lips with water
you should not make yourself throw up on purpose; Sips of water might assist keeping the airway
open by soothing the throat, after that We ought to visit a physician. We should remove solids if
they crack on your skin or clothing, Rinse the skin or clothing as necessary and We should gently
clean up any solid cracks on the floor, bench, or other surfaces to prevent producing dust. After that,
clean them with a moist cloth. Spills need to be cleaned up with a cloth and thoroughly rinsed.
My ability to reference a website to my work has also increased, as have my research and citation
skills. I learned that referencing is a crucial part of academic work, especially when getting material
from a book or online. It puts your work into context, shows the depth of your research while also
referencing other people's work. As a result, you must always give credit when using someone else's
ideas. References provide a variety of purposes in addition to preventing plagiarism, we may
recognise the input from other authors and scholars into our work by citing them, References should
always be accurate so that our readers can tell which sources of data we looked at.
I learned the value of using safety equipment throughout the experiment when I broke a pipette.
This served as a reminder to practice caution when using the equipment because much of it is made
of glass. We must constantly take precautions and wear safety gear when doing practical as a result.
For an experiment, I had to learn how to write a report, and I think the experience has enhanced my
writing skills. My capacity for teamwork has also increased. I gained a range of teamwork and
communication skills from these experiments that will help me in my professional career. I have also
learnt to Provide and receive feedback to make sure the experiments go well.
calorimetry
In my experiment, we used calorimetry to examine different substances' cooling curves to learn
more about cooling curves. The three states of a substance are solid, liquid, and gas. The makeup of
the chemicals depends on their current state. When a substance is solid, it indicates that its
molecules are evenly distributed, compressed, and close to one another with very strong
intermolecular forces; The molecules can vibrate and produce heat even though they cannot move
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