Unit 2- Practical Scientific Procedures and Techniques
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Unit 2 Assignment A - : Undertake titration and colorimetry to determine the concentration of solutions
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Unit 2- Practical Scientific Procedures and Techniques
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PEARSON (PEARSON)
This is my Unit 2A assignment. I spent lots of time and effort on this and have achieved a DISTNICTION from this. If you have any questions, enquires or need some assistance please feel free to send me a message. Good luck with your assignment!
Unit 2- Practical Scientific Procedures and Techniques
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BTEC Applied
Science
Chemistry
Unit 2:
Titration &
Colorimetry
Abdullah Shafiq
,A Report on Titration and Colorimetric Procedures
Introduction
During this investigation, my objective was to try to find the unknown concentration of a sample
of sodium hydroxide – which is also unknown. More importantly, using the techniques of
titration and colorimetry I want to see how these have dissimilar ways of conclusions to the
concentration of an unknown solution as well as how the calculation has diverse procedures of
working out the unknown solution. For the calibration process, using the masses of 0.1g, 1.0g ad
10g of weights I applied them to the balance just to see if the balance is in working order, making
amendments to the balance to get it to the precise mass.
Part 1: (Preparation of a standard solution)
Method to standardise the solution:
1) Firstly, weigh 1.35g of anhydrous sodium hydrogen carbonate.
2) Then, carefully pour the sodium hydrogen carbonate into a 250ml conical flask.
3) Once done, using distilled water, add 150 cm³ of the water into the flask - using a flask to
ensure no spillages occur – then swirl the flask until the sodium hydrogen carbonate is
dissolved entirely.
4) Finally, using a 250cm³ beaker; judiciously transfer the entire solution into a 250cm³
volumetric flask, then pour an additional 205cm³ more distilled water to make up the
solution.
Calculations
Equation - Na2CO3 + 2HCL –> 2NaCl + H2O + C02
Moles of Na2CO3 – 1. = 0.0161 (3sf)
Concentration of Na2CO3 – (9/560) / 0.250 = 0.0643 (3sf)
Evaluation
Taking the entire standardisation process into account, I feel that the practical was really
uncomplicated – essentially all I did was I mixed the sodium carbonate distilled water and this
resulted in the formation of sodium hydroxide. The process of standardisation ran as I wanted. I
had to make sure that I inverted the flask as it would ensure that the solution was thoroughly
mixed as this would allow no anhydrous sodium was left in its powder form and this is important
as it ensure that the result we get for the concentration of sodium hydroxide was as accurate as
possible. I also made sure that any solution was filled right to the exact point and so that the
meniscus was exactly on the line or point to once again ensure that the solution was as accurate
as possible.
Part 2: (HCL and the standard solution)
Aim:
, A Report on Titration and Colorimetric Procedures
The reason we are doing this is so we can find the hydrochloric acid’s concentration where I will
use the sodium carbonate as well as a known concentration and methyl orange – with this being
the indicator.
Apparatus:
Task 2 (HCL and a standard
solution)
We are aiming to find the
concentration of
hydrochloric acid using
sodium carbonate
which with a known
concentration and methyl
orange as the indicator.
Equipment list:
1. Graduated pipette (25 cm³)
2. Funnel
3. Conical flask (250 cm³)
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