american international college of arts and sciences antigua Laboratory Experimen

Question

american international college of arts and sciences antigua Laboratory Experiment 5 Verification of the Beer-Lambert Law Pre-lab Questions 1. You will be using a spectrophotometer to determine the absorbance of the Cu(NH)i complex in your solutions First you must select the appropriate wavelength () for the determination er aorlion t wonelength. What is the wavelength you select a. b. Explain your choice 2 In most spectrometric analyses it is important to prepare a blank containing all reagents except the analyte (the species being analysed) Refer to the sample preparation instructions outlined below and explain how you will prepare an appropriate blank for this experiment. Ahsorption Spactrum for Cu(NH 06 es 04 03 02 0 1 350 450 550 Answers to pre lab questions are to be submitted prior to the start of the Lab.

Explanation / Answer

From the given chart shown above

1.

a. wavelenght selected is at which the complex give maximum absorbance = 610 nm

b. wavelenght selected is at which the complex [Cu(NH3)4]2+ gave maximum absorbance.value.

2. The blank solution is this case would be made by dissolving CuSO4.5H2O in water.

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