An experiment was conducted using the the instructions below, and the results in the table below were obtained. Help me to answer the question below the procedure.
An experiment was conducted using the the instructions below, and the results in the table below were obtained. Help me to answer the question below the procedure.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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An experiment was conducted using the the instructions below, and the results in the table below were obtained. Help me to answer the question below the procedure.
Transcribed Image Text:Conc (ppm)
Blank
0.2
0.4
0.6
0.8
1.0
20X Dilution
Absorbance
0.0000
0.0274
0.0492
0.0681
0.0928
0.1117
0.0574
Transcribed Image Text:of the Sample to be Analyzed
A. Preparation
Take the mass of the tablet to the nearest 10th of a milligram. Place the tablet in a 250 ml Erlenmeyer
flask; add 25 ml 8 M HCI. Boil slowly on a hot plate for 5 minutes. Cool and add 10 ml deionised water.
Filter through a Whatman No. 1 filter paper. Transfer the filtrate to a 250 ml volumetric flask, dilute
to the mark with deionised water, and use this solution directly for the determination of copper. Take
a 10 ml aliquot, dilute to 100 ml and then analyze.
B. Determination of Copper
Calibration Curve: After setting the instrument parameters for copper, make appropriate dilutions.
Prepare a Cu²+ standard by pipetting 10 ml of the stock standard (10 µg/ml) into a 100 ml volumetric
flask and diluting it to the mark: From a 10-ppm stock take 10; 8, 6, 4, 2 ml into a 100 ml volumetric
flask and make up to the mark with deionised water to give 1, 0.8, 0.6, 0.4, 0.2 ppm solutions of Cu.
Aspirate the diluted standards into the flame and record the absorbance.
Treatment of Data
Plot calibration curves for the copper solutions (absorbance vs concentration). Determine the amount
Cu in your sample. Compare your values, as % by weight, with those of the vitamin tablet.
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