Once this point was reached, the timer was stopped and the time was recorded in Data Table #1. The same steps involving the addition of Na2S2O3 were repeated for Wells #2 and #3, using 2 mL of Na2S2O3 in each. The final times for each well was recorded in Data Table #1 in the appropriate blank. Once the first trial was completed for the first three experiments, a second trial was completed in Wells #4, #5, and #6 using the same procedure in order to increase accuracy. After each trial was conducted, each of the wells were emptied into the designated waste container and dried using a paper
Then an estimated (by trial and error) 1-3 grams of hydrated copper sulfate was added to a crucible with the lid on top. The total mass of the hydrated copper sulfate was recorded by subtracting the total mass of the crucible, lid, and sample from the mass of the crucible and lid (described in table 1.3). By attaching the wire triangle to the ring, the crucible was able to sit securely while having the bunsen burner underneath. Lighting the burner once again, each substance was heated for several minutes until estimated that the compound had changed color. Once a prevalent color change had been observed at approximately 4 minutes (blue green color) the crucible was set on the counter using the tongs to cool for approximately 5 minutes.
On the menu screen we selected to record percent of light transmitted to be displayed. Also before each time the percent transmitted was recorded, the Spectronic 20 was blanked with water. A secondary goal of week one is to compare the differences of the light absorbance and the percent of light transmitted of red, blue, and yellow. Figure 1 has the graph of the absorbance of red, blue, yellow, and KMnO4. Figure 2 has the graph of percent of light transmitted of red, blue, yellow, and KMnO4.
If a six was rolled for pile B, this meant a reaction had occurred and one piece of paper would be moved from pile B into pile C. Together, the dice rolls for piles A and B represented one unit of time passing. After each roll of the two dice, the amount of paper in each pile was counted and consequently recorded. This process was repeated until all reactant papers had reached pile C, indicating the reaction had gone to completion. For this experiment, 56 units of time had passed before the reaction had reached completion. In experiment two, three regions of the lab were once again designated to be regions “A”, “B”, and “C”.
Introduction The goal of this experiment was to acquire an understanding of the fundamentals of measurement in addition to analyzing the gathered data. During the experiment, an understanding of basic experimental error was gained as well as how to utilize the error equations to account for margins of error in each experiment. For Investigation 1, the mass, length and diameter of four separate cylinders was measured and utilized to calculate the volume and density of the cylinders. After recording these results in the table, the data of the cylinders was graphed. Then, in Investigation 2, a Geiger counter was utilized to measure background radiation in the lab at intervals of one minute for sixty minutes.
13) Set the spectrometer to a wavelength of 530 nanometers. 14) Place the cuvettes (numbers 1-6) with the appropriate substance and record it’s reading in the data table. 15) After each cuvette was tested, place the distilled water sample (Cuvette zero) to reset the spectrometer and to ensure that the scale is calibrated and repeat for each cuvette test. Data/Results: Tube Number Concentration Of CoCL2 (Mg/ML) CoCL2 Stock (ML) Distilled Water (ML) Spectrometry Reading at
Graphite carbon electrode was polished to a mirror-like surface with 1.0, 0.3 and 0.05 micron α-alumina powder in sequence and washed in supersonic for one minute before use. 3. RESULTS AND DISCUSSION 3.1 Cyclic voltammetric studies of copper-phen
0.1M 0.05M 0.025M 0.0125M 0.00625M Use equation C1V1 = C2V2 to calculate the amount of water needed to dilute the solution. 10ml of 0.1M KI + 10ml of deionized water = 20ml of 0.05M KI Measuring the time for the colour change to occur Using a pipette, add 1ml of H2O2, HCl, starch solution and 3ml of S2O3 into a cuvette. Set up the spectrophotometer and put the cuvette into the machine Data collection starts now, allow 5 seconds. Using a pipette, now add 1ml of KI into the cuvette containing the mixture. Data for this is collected for 300 seconds Repeat the steps above (1-5) three times to collect the average for the specific concentration.
When the results for the first test tube were recorded, then the next solution/mixture was prepared. The second test tube was exactly the same as the first, the only difference being that the SPM was this time set to 35oC. The temperature of the SPM gets increased by 1oC for every test tube solution, until test tube 7 with an SPM temperature of 40oC. After all the absorbencies for the varying temperatures had been recorded – the product concentration of each test tube solution was calculated using the absorbency readings at 10 minutes for each respective test tube mixture. The product concentration was calculated using Beer-Lamberts’ law of A = ECL.