Steps of using a colorimeter to work out concentration of a solution
- Created by: Risinghill
- Created on: 29-12-13 12:21
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- Using a colorimeter to work out the concentration of a solution.
- Select a filter with a complimentary colour to the colour being tested.
- Allows only the most strongly absorbed wavelength to pass through the sample.
- Make a range of standard solutions for the test sample.
- There should be samples both above and below the unknown sample to.
- This allows a higher accuracy when discover the unknown concentration and will also speed up the process.
- Zero the colorimeter using a pure solvent sample.
- This will often be water.
- Measure the absorbance of each of the standard solutions.
- It is also recommended at this point to plot a calibration curve
- The graph should have the axis: concentration against absorbance
- Measure the absorbance of the unknown sample.
- Use the calibration curve to determine the concentration of the unknown sample.
- It is also recommended at this point to plot a calibration curve
- There should be samples both above and below the unknown sample to.
- Select a filter with a complimentary colour to the colour being tested.
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