I capped the tube and I mixed until the tablet disintegrates. I wait 5 minutes for the color to develop. Then I compared the blue color of the solution to the potassium color chart: L = 40 lbA/6" soil, M = 80 lb A/6" soil, and H = 160 lb A/6" soil. For the nitrogen I used the pipet to transfer 25 drops of the clear solution above the soil to a square test tube. Then, I filled the tube to the shoulder with distilled water.
Juliana Park Mayumi Tamada CHEM 111B LAB/ M-F 1-4PM 15 August 2012 Spectroscopy Lab Introduction In this lab, the molar absorptivity of the complex FeLn2+ will be determined by using the absorbance of the complex and its concentration. The absorbance will be found by using a spectrophotometer. For the next part of the lab, the formula of the complex will be determined by also using the volume of ligand and the absorbance again. Experimental There are two different parts to the experiement. In the first part, five 100 mL flasks of 5 mL ligand solution, 5 mL 2 M sodium acetate, 4 mL 3 M NH2OH, and 1-5 mL Fe2+ solution are diluted with water.
The purpose of this experiment was to determine the effects of substrate concentration and pH on the initial rate of enzyme-controlled reaction. METHODS I conducted five experiments. In each experiment, I had five test tubes with constant pH levels of an enzyme solution. The pH levels over the 5 experiments were 3, 5, 7, 9, and 11. I added varying levels of substrate to the test tubes in each experiment.
We now slowly pour the solution into a funnel with filter paper. The extract along with 2 pieces of Iodine are added to a new beaker and left for 10 minutes. Finally to determine if the lab was successful, three tests are conducted for Iodine, Iodide and triiodide. The objective is to produce a tincture of iodine by extracting iodide and other components from seaweed. Warm up Activity 1.
Repeat step two, then continue adding 5 dry pennies each step to balance until you have used all 30 pennies 4. Fill Graduated cylinder with 20mL of distilled water 5. Drop 5 pennies (one at a time), into the graduated cylinder and record new volume 6. Repeat adding 5 pennies each time and record 7. Record Data in Notebook 8.
6. Repeat step 5 four times. Data/Observations: Conclusion: Recall: We did a lab to learn about how the mass of an egg changes when it is put in different substances. Explain: We recorded the masses of two eggs every 15 minutes. One was put in water while the other was put in corn syrup.
The discoloration is measured in percent transmittance of light over 30minutes at 5 minute intervals. The change in dye color is the associated with cellular respiration activity, and will be used to record the cellular respiration rate in mitochondria isolated from pulverized lima beans (Phaseolus lunatus) and subsequent effects of different substrate concentration, pH, and metabolic inhibitors . If the difference of light percent transmission produced by (DPIP) can be recorded over time associated with the cellular respiration rate then the rate of cellular respiration of mitochondrion in varying substrate concentrations, pH , and metabolic inhibitor solutions can be tested. The results from these experiments can be generalized and applied to other organisms with similar reactions to such substances. Materials and Methods The procedures employed in this laboratory are described in Cell Physiology and Metabolism Lab
The two petri dish that contained E. coli and S. Marscensen were placed upside down and allowed the growth of the bacteria to interact with the antibiotics for a week. Results: The bacteria in the petri dish were left to grow for a week and in this process
Alex Pascal Lab Partners: November 12, 2009 Period 8 Periodicity in the Properties of Some Representative Elements Purpose: The purpose of this lab was to if elements in the same family react similarly. Procedure: A) A test tube, test tube rack was acquired. A small amount of HCl was measured in a graduated cylinder and poured into test tube. Then a bunsen burner, a small amount of Mg ribbon and a wooden splint was acquired. The Mg ribbon was then placed in HCl in the test tube and observed.