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Essay on the lab report
Essay on the lab report
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Glory Nguyen October 20, 2015 Period G Dissolving Oxygen Introduction In this lab, you will be testing the levels of oxygen in water samples with different temperatures and water samples exposed to different light distances. This will show us where the most oxygen is produced, which is where most of the organisms are. The relationship between oxygen and carbon assimilation is when oxygen is being produced the the photosynthesis plants, they release oxygen. In turn, it is then being inhaled by an organism that needs oxygen, releasing carbon as carbon fixation. So more carbon means more oxygen being released. The concentration of dissolved oxygen is obviously a lot higher during the afternoon, this is when the sun is out and where photosynthesis …show more content…
Record the temperature of the cold water sample onto Table #1 Immerse the test tube under the cold water and stop in with a rubber stopper (while under water). Remove the rubber stopper and add 6 drops on Winkler's solution #1 up into the test tube with cold water. Then add 6 drops of Winkler's solution #2 into the test tube with cold water. Place the rubber stopper back on the test tube with cold water; careful for spillage. Invert the test tube with cold water several times to mix the solution (brown precipitation will form). Allow the precipitate to settle for 5-10 minutes. Repeat steps 2-8 with the room temperature and warm temperature samples. Remove the stoppers and add 6 drops of concentrated sulfuric acid to each of the test tubes. Put the rubber stoppers back on the test tubes and invert them; this dissolves the brown precipitate to a yellowish-amber solution. Then titrate each of the fixed water samples. *In the case that you don't know how to titrate, refer to the bottom of the page. Method/ Procedure (for Part
We then took 1ml of the 0.1% solution from test tube 2 using the glucose pipette and added it to test tube 3, we then used the H2O pipette and added 9ml of H2O into test tube 3 creating 10ml of 0.01% solution.
The procedure of the lab on day one was to get a ring stand and clamp, then put the substance in the test tube. Then put the test tube in the clamp and then get a Bunsen burner. After that put the Bunsen burner underneath the test tube to heat it. The procedure of the lab for day two was almost exactly the same, except the substances that were used were different. The
Repeat for each trial. Rinse volumetric pipette with vinegar and drain into the waste beaker. Weigh and record the mass of each 200mL beaker. Add 10.00mL of vinegar into each beaker and weigh them and record their again. Add 50mL of de-ionized water to the beakers and place them under the drop counter on top of a stir plate, submerging the pH meter into the solution. Place the stir bar into the beaker and carefully turn on the stir plate so that the stir bar spins without splashing or hitting the sides of the beaker or the pH
10. Point the flask away from everyone and open the two-way valve in order to release pressure from the flask. Remove the stopper assembly, then fill up the flask with water. Discard of the solution in the sink.
3. Fill up the 50 milliliter beakers all the way up with deionized water. After, use your scopula to scoop out a small portion of one substance and put in into your beaker. Then put your hot plate onto medium temperature and rest the mixture onto the plate.
3. Add on of the following volumes of distilled water to the test tube, as assigned by your teacher: 10.0mL, 15.0mL, 20.0mL, 25.0mL, 30.0mL. (If you use a graduated cylinder, remember to read the volume from the bottom of the water meniscus. You can make more a more accurate volume measurement using either a pipette or a burette.)
After five the test tube was removed and cooled to room temperature. Three more test tubes were obtained and labeled 1, 2, and 3. The correct reagent was added to each test tube as seen. The spectrophotometer was adjusted
A substance called an indicator is added to show the end of the titration. d. Clamp the buret on one side of the buret clamp. Place a white piece of paper labeled "Unknown Acid" under this buret. Drain any remaining pre-rinsed acid solution into a beaker labeled "waste solution". e. Fill this buret with your Unknown acid solution to the zero mark or slightly below it (Not above the zero mark).
For this experiment, you will add the measured amount of the first sample to the measured amount of the second sample into its respectively labeled test tube then observe if a reaction occurs. In your Data Table, record the samples added to each test tube, describe the reaction observed, if any, and whether or not a chemical reaction took place.
In each test tube, place 5ml of pure hydrogen peroxide into each test-tube using the syringe.
3.) Divide your 30g of white substance into the 4 test tubes evenly. You should put 7.5g into each test tube along with the water.
== § Test tubes X 11 § 0.10 molar dm -3 Copper (II) Sulphate solution § distilled water § egg albumen from 3 eggs. § Syringe X 12 § colorimeter § tripod § 100ml beaker § Bunsen burner § test tube holder § safety glasses § gloves § test tube pen § test tube method = == = =
solutions and add them to a test tube rack. I will then cut up a
Begin collecting samples with the pure hexane. Keep adding hexane so that the silica gel column does not run dry. Collect one 20 ml sample. Repeat with 90:10 hexane and collect 4 20-mL bottles. Repeat with 80:20 hexane and collect 2 20-mL samples.
g. of KI in 10 mL of water. Add the KI solution dropwise to the test