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Learning aim a: undertake colorimetry to determine concentrations of solutions
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By: delviadominic2004 • 2 year ago
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Name: Malik MohammedUnit 2: practical scientific procedures and techniques
Learning aim a: undertake colorimetry to determine
concentrations of solutions
Aims :
To find the absorptivity of a unknown sample solutions
using data and the beer lambert law
To prepare own concentration of copper sulphate solution
by weighing hydrated copper (II) sulphate solid
CuSO4.5H2O dissolving in water making up to a correct
volume.
Use a colorimeter to accurately determine concentrations
of sample a and b which are two different concentrations
of copper (II) sulphate (CuSO4) solution
What is a colorimeter?
A colorimeter can determine the absorbency of light
waves. During colour analysis, the variation in the
strength of electromagnetic radiation in the visible
wavelength portion of the spectrum following transmission
or reflection of an object or solution is measured. This
calculation may help to determine the composition of
substances since the volume and colour of light received
or emitted depends on the properties of the solution.
, Making a standard solution
Equipment:
Scale
Weights
Hydrated copper (II) sulfate
Weighing boat
Distilled water
Glass stirring rod
Funnel
Volumetric flask
Measuring cylinder
Cork
Method:
P2, P3, M1
1. Calibrate the scale for weighing the mass.
2. Measure 12.475 grams of hydrated copper (II) sulfate into
a weighing boat.
3. Pour into a beaker and wash the weighing boat with
distilled water.
4. Use a stirring rod to dissolve the solid in the water, the
solution will turn blue.
5. Wash the glass rod with distilled water.
6. Pour the liquid from the beaker to the 100ml volumetric
flask through a funnel to prevent spilling the solution.
7. Rinse around the edges of the beaker into the volumetric
flask.
8. Continue to fill the volumetric flask up to the 100ml line.
9. Place a cork on top of the volumetric flask. Invert the flask
to mix and label.
Problems and issues that occurred
When adding distilled water through the funnel to the
volumetric flask, we went beyond the 100cm3 level. We then
repeated the process of once again making the traditional
solution. Ensure that you slowly incorporate drops of remaining
water into the volumetric flask and if necessary, drop by drop
until the graduation point of 100cm3 is reached.
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