You prepare a standard solution of ferrous ammonium sulfate thatis 50.0 ppm in Fe. You pipette aliquots of 0.50 mL, 1.00 mL, 2.00mL, 4.00 mL, 8.00 mL, and 10.00 mL into 100-mL volumetric flasks,add 1 mL of hydroxylamine solution, 3 mL of o-phenanthrolinesolution, and sufficient citrate to adjust to pH 3-4 as describedin your laboratory instructions. After diluting each sample to the100 mL mark, and allowing time for the color to develop, you recordthe absorbances shown in the table.
Fe Conc.(ppm) Absorbance 0.50 0.144 1.0 0.250 2.0 0.332 3.0 0.474 4.0 0.696 5.0 0.808
You next add 50 mL of your unknown sample to a 100 mL volumetricflask, treat it with hydroxylamine, o-phenanthroline, and citrateas described above, dilute to the mark, and determine theabsorbance of the diluted sample to be 0.387
What is the concentration of Fe in your unknown?
You prepare a standard solution of ferrous ammonium sulfate thatis 50.0 ppm in Fe. You pipette aliquots of 0.50 mL, 1.00 mL, 2.00mL, 4.00 mL, 8.00 mL, and 10.00 mL into 100-mL volumetric flasks,add 1 mL of hydroxylamine solution, 3 mL of o-phenanthrolinesolution, and sufficient citrate to adjust to pH 3-4 as describedin your laboratory instructions. After diluting each sample to the100 mL mark, and allowing time for the color to develop, you recordthe absorbances shown in the table.
| Fe Conc.(ppm) | Absorbance |
| 0.50 | 0.144 |
| 1.0 | 0.250 |
| 2.0 | 0.332 |
| 3.0 | 0.474 |
| 4.0 | 0.696 |
| 5.0 | 0.808 |
You next add 50 mL of your unknown sample to a 100 mL volumetricflask, treat it with hydroxylamine, o-phenanthroline, and citrateas described above, dilute to the mark, and determine theabsorbance of the diluted sample to be 0.387
What is the concentration of Fe in your unknown?
Related textbook solutions
Basic Chemistry
Principles of Chemistry Molecular Approach
Chemistry: Structure and Properties
Principles of Chemistry Molecular Approach
Chemistry: A Molecular Approach
Chemistry: A Molecular Approach
Principles of Chemistry: A Molecular Approach
