EXPERIMENT 7 QUESHOS PRE-LABORATORY OF A COPPER ION INSOLUTION NAME DATE 1. What

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EXPERIMENT 7 QUESHOS PRE-LABORATORY OF A COPPER ION INSOLUTION NAME DATE 1. What is the primary purpose of this experiment 2. How many grama of Cu(C2H302/2 HO (FW-199 65 gmo are needed to prepare 800.0 ml of a 0.250 M solution? stock solution of Cu C2H30p2 has a concentration of 0.270 M. IE 6.00 mL of this solution is transferred to a 50.00 mL lask and then diluted with distilled water, what is the final concentration of Cu- ion? Using the calibration eurve below, what is the concentration of a Cu2+ solution which had an absorbance of 0.450? 4. 0.800 0.700 1 s 0.500 0.400 0.300 0.200 0.100 0.000 000 100 0.200 300 0.400 .500 0.500 .700 800 EXPERIMENT 7 12

Explanation / Answer

1) What is the purpose of this experiment?

The pupose of the experiment is to determine the concentration of Copper ions in an unknown, using a spectrophotometer and the beer lamberts law: A=ebc, where A is the absorbance, e is molar absorptivity, b is the path length of the sample and c is concentration. Once absorbances are obtained for known concentrations of Cu ions, a graph of Absorbance vs Concetration is plotted, from which concentraion of unknown cu can be obtained from the absorbance value.

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