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AQA A Level Chemistry复习笔记8.2.6 Colorimetry & Complex Ions

Category: A-level课程, 教材笔记, 福利干货 Date: 2022年7月4日下午4:34

Colorimetry can be used to measure the absorption of radiation using a colorimeter
This uses a lamp as a source of white light, which passes through a filter to produce light of one colour
- This colour will be the one that the sample will absorb the most and is called its complementary colour
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

6.1.3-Colorimetry-Set-Up-1

A simple diagram representing the component parts involved in colorimetry

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

Visible-Spectroscopy-Calibration-Curve