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BTEC Applied Science Unit 2 Assignment A
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BTEC Applied Science Unit 2 Assignment A
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Concentrate On Keeping Up withStandards
Aims
This assignment requires me to show and explain how I used different skills in a range of practical
procedures and techniques to make and assess standard solutions. I produced two titrations to work
out the concentration of solutions. Additionally, I produced colorimetry to work out the absorbance
of a solution.
Part 1- Titration
Preparation of a Standard Solution: Standard Solution
for Sodium Carbonate
Aims for Part 1
Within this assignment I learnt how to create a standard solution and for this to occur I calculated
the amount of sodium carbonate needed to make a standard solution. Sodium carbonate is a
primary standard and it is pure and stable.
Calculation-
Sodium Carbonate (Na2CO3)
Before conducting the titration, standard solution was made. 250cm 3 of solution which has a
concentration of 0.05mol/ dm3, was used to work out how many grams of Na 2CO3 were used via this
calculation-
1. Concentration = Moles/ Volume x 1000
- Moles = Mass/ Mr
2. Mass = 1.26g
- Moles = 1.26/ 106 = 0.01188679 0.011 moles
- Concentration = 0.011/ (250/ 1000(= 0.25)) = 0.044 moles/ dm 3
3. Volume = 250cm3 = 0.25dm3
- 1.26g Sodium Carbonate is required
, Equipment
- Distilled Water
- Funnel
- Weighing Boat
- Balance to 2dp (provides results to be accurate)
- Sodium Carbonate
- Volumetric Flask
- Glass Stirring Rod
- Beaker
Risk Assessment
Hazard Risk Safety Action Risk Level
Precaution
Solvent The skin and eyes When handling The hands and Medium
may get irritated. with solvents, eyes should be
safety goggles washed
and gloves thoroughly.
should be worn.
Glass Beakers The sharp Be aware of If any cuts do Medium
residues may surroundings as occur, it should
cause injury to the investigator be washed under
the skin. may stumble and cold water. Then
drop the beaker. the supporter
(teacher) should
be informed
about the
incident.
Acetone The skin and eyes When handling The hands and Medium
could get with the eyes should be
irritated. acetones, safety thoroughly
goggles and washed.
gloves must be
worn.
Method
The weighing scale was calibrated to then proceed with. The weighing scale was started with zero.
Approximately 1.25g and 1.45g of anhydrous sodium carbonate was weighed onto a weighing boat,
then recording the mass of the sodium carbonate it was 1.26g. The sodium carbonate was
transferred to a 250cm3 beaker. 150cm3 of distilled water was transferred to the beaker and to
dissolve the sodium carbonate, a stirring rod was used. The solution was transferred into a
volumetric flask using a funnel to accurately transfer it without any spillages. With the use of more
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