AQA A Level Chemistry復習筆記8.2.6 Colorimetry & Complex Ions
Colorimetry & Complex Ions
Colorimetry & Complex Ions
- For example hexaaquacopper(II) solution is a pale blue colour which absorbs red light
- It's complementary colour is blue which is what is transmitted
A simple diagram representing the component parts involved in colorimetry
Worked Example
Outline a practical method for the preparation of an unknown concentration of metal aqua ion solution by colorimetry.
Answer:
-
- Make up metal aqua ion solutions of known concentrations
- Measure absorption or transmission
- Plot a calibration curve (absorbance vs concentration)
- Measure absorption of unknown
- Determine concentration of unknown
Calibration curve from colorimetry results, showing the absorbance of an unknown being used to determine the concentration
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