Copper In Brass Lab
Spectrophotometric Determination of Copper in Brass
Your Name Here
Partners: his/her name here
Chemistry 1290-xxx
Date Report is Due
TA: TA’s name here
Purpose:
The primary purpose of this experiment was ……
Another purpose of this experiment was ……
Learning about this type of analysis was important in an everyday context because ...
Safety Information:
During this lab nitric acid will be used as an oxidizing agent and (NO2) nitrogen dioxide will form. This gas is extremely toxic, and should not be inhaled. A use of a fume hood should be used during the process of adding nitric acid (HNO3) to the solution. Additionally, safety goggles should be worn throughout the entire lab. Shoes should be closed toed, clothing should cover …show more content…
One test tube was then filled half full with the same solution of nitric acid and wiped clean of finger prints and smudges. This sample was used as a blank to set the zero absorbance for the spectrophotometer. The direction of the test tube was marked and noted for future use. The student then selected a New Absorbance vs. Concentration experiment in SpectroPro. This was done in order to calibrate the spectrophotometer. The wavelength setting was set on the spectrophotometer at 620nm and the machine was set absorbance, listed as unit (A). The student set the blank to zero absorbance and finished the calibration of the spectrophotometer. The solution in the test tube was then discarded and the test tube was set …show more content…
50 mL of concentrated nitric acid was measured in a graduated cylinder, 20 mL of which was transferred to the 80mL test tube. This test tube was placed in the Erlenmeyer flask with enough water covering at least 2 cm of the test tube. The coiled copper wire from earlier was cautiously placed into the test tube. The fume hood was lowered to prevent any inhalation of the toxic gas emitted from the exothermic reaction. The remaining nitric acid (HNO3) was slowly added during the dissolving of the copper wire.
Approximately 75 mL of deionized water was poured into a 250 mL beaker. The nitric acid solution was transferred from the 80mL test tube to the water in the beaker. The solution changed from dark green to bright blue. After the solution cooled, it was transferred to a clean 250 mL volumetric flask. The test tube that contained the nitric acid solution was rinsed and those rinses were also added to the volumetric flask. DI water was added to the mark on the volumetric flask. The flask was stoppered and inverted three times to ensure the solution was
Your Name Here
Partners: his/her name here
Chemistry 1290-xxx
Date Report is Due
TA: TA’s name here
Purpose:
The primary purpose of this experiment was ……
Another purpose of this experiment was ……
Learning about this type of analysis was important in an everyday context because ...
Safety Information:
During this lab nitric acid will be used as an oxidizing agent and (NO2) nitrogen dioxide will form. This gas is extremely toxic, and should not be inhaled. A use of a fume hood should be used during the process of adding nitric acid (HNO3) to the solution. Additionally, safety goggles should be worn throughout the entire lab. Shoes should be closed toed, clothing should cover …show more content…
One test tube was then filled half full with the same solution of nitric acid and wiped clean of finger prints and smudges. This sample was used as a blank to set the zero absorbance for the spectrophotometer. The direction of the test tube was marked and noted for future use. The student then selected a New Absorbance vs. Concentration experiment in SpectroPro. This was done in order to calibrate the spectrophotometer. The wavelength setting was set on the spectrophotometer at 620nm and the machine was set absorbance, listed as unit (A). The student set the blank to zero absorbance and finished the calibration of the spectrophotometer. The solution in the test tube was then discarded and the test tube was set …show more content…
50 mL of concentrated nitric acid was measured in a graduated cylinder, 20 mL of which was transferred to the 80mL test tube. This test tube was placed in the Erlenmeyer flask with enough water covering at least 2 cm of the test tube. The coiled copper wire from earlier was cautiously placed into the test tube. The fume hood was lowered to prevent any inhalation of the toxic gas emitted from the exothermic reaction. The remaining nitric acid (HNO3) was slowly added during the dissolving of the copper wire.
Approximately 75 mL of deionized water was poured into a 250 mL beaker. The nitric acid solution was transferred from the 80mL test tube to the water in the beaker. The solution changed from dark green to bright blue. After the solution cooled, it was transferred to a clean 250 mL volumetric flask. The test tube that contained the nitric acid solution was rinsed and those rinses were also added to the volumetric flask. DI water was added to the mark on the volumetric flask. The flask was stoppered and inverted three times to ensure the solution was