2021-11-17
Spectrophotometric Determination of the Copper Ion
In this experiment, the concentration of copper(II) ions in an unknown solution was determined spectrophotometrically using the external calibration method. Since Cu²⁺ ions do not naturally produce an intensely colored solution, the complex ion [Cu(NH₃)₄]²⁺ was formed by adding aqueous ammonia, resulting in a vibrant complex that absorbs light at 610 nm.
The absorbance readings of the unknown solution were compared to the calibration curve, enabling the concentration of Cu²⁺ in the unknown sample to be interpolated. The data, calibration curve, and relevant calculations were then summarized to conclude the experiment.
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