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Unit 2- Practical Scientific Procedures and Techniques Help Sheets

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May 8, 2021
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2020/2021
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EVERYTHING YOU RESEARCH NEEDS TO BE REFERENCED.
● An introduction to the assignment, what you will be looking at in your report (use
assignment brief context).
● Method of calibration of the following equipment and your results:pH probe, Balance,
Volumetric flask, Pipette, Burette
● What that calibration means for your results, will you change equipment, change your
results?
● Risk assessment for making a standard solution of Na2CO3, why arecertain steps in
your method done on a safety basis
● Method to make a standard solution of Na2CO3
● Calculate the moles and concentration of Na 2CO3showing step by step process
including all units
● Risk assessment for titration of HCl, Na2CO3and NaOH. why are certain steps in your
method done on a safety basis
● Method of titration against HCl using an indicator, pictures of your results pre and
post colour change
● What steps in your method and preparation were done to get the most accurate
results
● Results including, a rough trial, 3 concordant results, and the average
● Calculate the moles of Na2CO3used in the titration
● Calculate the moles and concentration of HCl in the titration
● Method of titration of HCl and NaOH using a pH probe
● What steps in your method and preparation were done to get the most accurate
results
● Results table of pH after every cm3 added until pH 7 is reached
● Hand plotted graph of amount added and pH, add a smooth curve through all points,
draw on a horizontal line at pH 7, write on what volume this was
● Calculate the moles of HCl used in the titration
● Calculate the moles and concentration of NaOH
● Compare your results for both titrations with teacher results and other students
results (use numbers), how accurate are your results compared to both, what could
have caused errors in your practical
● If you were to redo the practical how would you change the METHOD to make it more
accurate, why would they increase the accuracy/reliability/repeatability/precision?
Justify the method steps you did to make your practical accurate
● If you were to redo the practical how would you change the EQUIPMENT to make it
more accurate, why would they increase the
accuracy/reliability/repeatability/precision?Justify the equipment you used to make
your practical accurate
● Method of calibration of the following equipment and your results:Balance, Volumetric
flask, Pipette, Colorimeter
● What that calibration means for your results, will you change equipment, change your
results?
● Risk assessment for making a standard solution of CuSO 4, why arecertain steps in
your method done on a safety basis
● Method to make a standard solution of CuSO 4

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