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Concentration of known Absorbance of known iron solutions iron solution (in mg/liter) 1.0 mg/liter 0.039 1.5 mg/liter 0.058 2.0 mg/liter 0.078 2.5 mg/liter 0.0 96 Unknown Sample No:

Concentration of known Absorbance of known iron solutions iron solution (in mg/liter) 1.0 mg/liter 0.039 1.5 mg/liter 0.058 2.0 mg/liter 0.078 2.5 mg/liter 0.0 96 Unknown Sample No:

Chemistry
Chemistry
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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
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O T.J.Maxx Rie Name: REPORT SHEET Concentration of known Absorbance of known iron solutions iron solution (in mg/liter) 1.0 mg/liter 0.039 1.5 mg/liter 0.058 2.0 mg/liter 0.078 2.5 mg/liter 0.0 96 Unknown Sample No: Unknown Iron sample No.: 3. Absorbance of unknown iron sample:O·079 Concentration of unknown iron sample from graph by interpolation (mg/liter): Reference value of unknown iron sample 0.078 % error (show calculations) : QUESTIONS
Transcribed Image Text:O T.J.Maxx Rie Name: REPORT SHEET Concentration of known Absorbance of known iron solutions iron solution (in mg/liter) 1.0 mg/liter 0.039 1.5 mg/liter 0.058 2.0 mg/liter 0.078 2.5 mg/liter 0.0 96 Unknown Sample No: Unknown Iron sample No.: 3. Absorbance of unknown iron sample:O·079 Concentration of unknown iron sample from graph by interpolation (mg/liter): Reference value of unknown iron sample 0.078 % error (show calculations) : QUESTIONS
1:06 ul 5GE Iron in Water Online La... PROCEDURE: 1. Obtain the standard iron solution whose concentration is 10 mg/liter. Fill a clean buret with this standard iron solution. (Note: Be sure that you've rinsed the buret with 2 or 3 ml of this iron solution before completely filling it.) 2. Obtain four 100 ml volumetric flasks. Label these flasks as follows: 1.0 mg/liter, 1.5 mg/liter, 2.0 mg/liter, and 2.5 mg/liter. 3. Into each flask, buret the proper amount of standard iron solution in order to prepare the concentration written on each flask. Proceed as shown below, Flask no. Concentration Milliliter of iron solution to put into each flask 1 1.0 mg/liter 10 ml 1.5 mg/liter 15 ml 2.0 mg/liter | 2.5 mg/liter 3 20 ml 4 25 ml 4. Fill each flask with sufficient water to bring the total volume to 100 ml. The 100 ml mark is noted on the neck of the volumetric flask. These four flasks now contain iron solutions whose concentrations are 1.0 mg/liter, 1.5 mg/liter, 2.0 mg/liter, and 2.5 mg/liter. 5. Using a 25-ml graduated cylinder, measure 25 ml of each standard and place it into a 100-ml beaker. (Note: Label these beakers so that you know which beaker contains a particular iron solution.) 6. Also place 25 ml of one Unknown solution into a 100-ml beaker. Add the contents of one FerroVer powder pillow to cach beaker (standard and unknown), and stir each solution. If iron is present, an orange-red color develops. 7. 8. Let each solution stand for two minutes after adding the powder pillow. Then within ten minutes, determine the absorbance of each solution. 9. Use colorimeter to determine the absorbency of each solution. (Your instructor will demonstrate how to operate the colorimeter). 10. Construct a graph (use attached graph sheet). Plot absorbance (on y axis) versus concentration (on x axis) for each of the known iron samples. From this graph and the absorbance of your unknown sample, determine the concentration of iron in your unknown sample. Name: Dashboard Calendar To Do Notifications Inbox 因
Transcribed Image Text:1:06 ul 5GE Iron in Water Online La... PROCEDURE: 1. Obtain the standard iron solution whose concentration is 10 mg/liter. Fill a clean buret with this standard iron solution. (Note: Be sure that you've rinsed the buret with 2 or 3 ml of this iron solution before completely filling it.) 2. Obtain four 100 ml volumetric flasks. Label these flasks as follows: 1.0 mg/liter, 1.5 mg/liter, 2.0 mg/liter, and 2.5 mg/liter. 3. Into each flask, buret the proper amount of standard iron solution in order to prepare the concentration written on each flask. Proceed as shown below, Flask no. Concentration Milliliter of iron solution to put into each flask 1 1.0 mg/liter 10 ml 1.5 mg/liter 15 ml 2.0 mg/liter | 2.5 mg/liter 3 20 ml 4 25 ml 4. Fill each flask with sufficient water to bring the total volume to 100 ml. The 100 ml mark is noted on the neck of the volumetric flask. These four flasks now contain iron solutions whose concentrations are 1.0 mg/liter, 1.5 mg/liter, 2.0 mg/liter, and 2.5 mg/liter. 5. Using a 25-ml graduated cylinder, measure 25 ml of each standard and place it into a 100-ml beaker. (Note: Label these beakers so that you know which beaker contains a particular iron solution.) 6. Also place 25 ml of one Unknown solution into a 100-ml beaker. Add the contents of one FerroVer powder pillow to cach beaker (standard and unknown), and stir each solution. If iron is present, an orange-red color develops. 7. 8. Let each solution stand for two minutes after adding the powder pillow. Then within ten minutes, determine the absorbance of each solution. 9. Use colorimeter to determine the absorbency of each solution. (Your instructor will demonstrate how to operate the colorimeter). 10. Construct a graph (use attached graph sheet). Plot absorbance (on y axis) versus concentration (on x axis) for each of the known iron samples. From this graph and the absorbance of your unknown sample, determine the concentration of iron in your unknown sample. Name: Dashboard Calendar To Do Notifications Inbox 因
Expert Solution
Step 1 Answer

Concentration of unknown Iron sample from graph is determined as 2.05 mg/L

                                                                                              % Error = 2.5%

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