Spectrophotometric Analysis Of Copper (I-Iodide

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Experiment 2: Preparation and Spectrophotometric Analysis of Copper(I) Iodide Abstract: This experiment aims to determine the concentration of “Purified CuI” sample. Crude CuI is obtained by reacting CuSO4.5H2O with KI and Na2S2O3 in de-ionized water. A series of decanting and centrifugation is carried out to extract the crude CuI. Crude CuI was later purified by dissolving it in hot KI solution. The solution was later transferred into de-ionized water and placed in an ice bath to allow for re-precipitation of “purified CuI” to settle. This is to ease the process of decanting and centrifugation carried out later. The concentration of “purified CuI” was determined by first diluting a solution of “purified CuI” twice, then carrying out UV-Vis spectrophotometry. A calibration graph was obtained using four standard Cu2+ solutions of differing concentration. Thus by comparing the absorbance level and the concentration of the “purified CuI” with the calibration graph, we can deduce the concentration of “purified CuI”. Using this information the mass percentage of copper in a purified CuI can be calculated and it was found to be 28.55% Aims: 1. To…show more content…
2ml of 10% ammonium citrate was added to each beaker. The pH was then adjusted to 8.5 by adding 10 drops of 5M NH4OH(aq) to each beaker. 3ml of 0.1% cuprizone was added to each beaker. The four solutions were then transferred to 25ml volumetric flasks. The beakers were washed with de-ionized water, and the washings were combined with the solutions in the 25ml volumetric flask. De-ionized water was then added to make up the 25ml standard solution A to D. Spectrophotometric analysis was then carried out on the four standard solutions. The absorbance vaule at 600nm was recorded for each standard solution. These data were used to obtain the calibration

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