Sodium Acetry Lab

Lastly, the water that the beakers were washed with may have steadily lowered the temperature of the glass throughout the trials and therefore affected the base temperature of the vinegar and the temperature of the

After the twenty minutes elapsed, the flask was cooled to room temperature and then titrated with the remaining NaOH until the colorless solution remained pink. The final volume was then recorded. While solution #1 was heating the same process was repeated with solution#2 and the second burette

The next step in this lab is to rinse the Erlenmeyer flask with distilled water down the drain and then repeat the experiment, this time adding 10 ml of 0.10M KI and 10 ml of distilled water to the flask instead. The flask should again be swirling to allow the solution to succumb to the same temperature as the water bath and once it has reached the same temperature, 10 ml of 3% H2O2 must then be added and a stopper must be immediately placed on the flask and recording should then begin for experiment two. After recording the times, the Erlenmeyer flask must then be rinsed again with distilled water down the drain. After rinsing the flask, the last part of the lab can now be performed. Experiment three is performed the same way, but instead, 20 ml of 0.10 ml M KI and 5 ml of distilled water will be added and after the swirling of the flask, 5 ml of 3% H2O2 will be added. After the times have been recorded, data collection should now be complete.

a) Tap and drag over the area of the graph where the resting heart rate is displayed to select the data.

The first experiment begun by filling a 600-ml beaker, almost to the top, with water. Next, a 10-ml graduated cylinder was filled to the top with water. Once water was added to the beaker and graduated cylinder, a thumb was placed over the top of the graduated cylinder. This would ensure that no water was let out and no bubbles were let into the graduated cylinder. Next, it was turned upside down and fully submerged into the beaker. Then, a U-shaped glass tube was attained. The short end of the glass tube was placed into the beaker with the tip inside of the graduated cylinder. Next, a 50-ml Erlenmeyer flask was received. After, 10-ml of substrate concentration and 10-ml of catalase/buffer solution were placed into the flask. A rubber stopper was then placed on the opening of the flask. After adding these, the flask was held at the neck and spun softly

The difference was in how long it took for the bubbles to come to the surface and the solution to become clear. Also, when doing the lab, once the correct temperature for the water was reached, the experimenter pulled the beakers out one by one completing all 5 trials. This may have caused slight fluctuations in data because by the time the 4 trials were finished, the temperature of the beaker may have increased by a few degrees. As for the act of measuring, there was a slight error because the experimenters did not take the beakers off the hot plate at exactly 30.00 degrees, or whatever the temperature may be. In order to provide more accurate results, the experimenter could do all

The weight of each 50ml beaker (used for weighing the mass of dissolved Potassium chloride after the evaporation of water) should be recorded. If the experimenter were to weigh the mass of one beaker and take it as a default mass, the latter may be a source of error.

7. Two minutes later, there was a layer of salt accumulated in the bottom of the beaker once the stirring was done, indicating the end of the experiment. 8. Steps five to seven were repeated except using the room temperature water. Data/Results: See the graphs/table Conclusion:

Rinse out beaker and dry it, preparing for next trial. Also reset stopwatch. Repeat steps 10-16 two more times until you have completed three trials in total. Measure the temperature of the hot water in celsius and record it to ensure consistency in temperature throughout the experiment.

This experiment provided accurate data of how a mixture of solids, and liquids consisting of both nonpolar and polar substances can be separated using vacuum filtration and water. The separation of oil from the sand, KNO3, and CuSO4 mixture using ethyl acetate was performed using a vacuum filtration. Ethyl acetate is an ester of ethanol and acetic acid with a formula of CH3-COO-CH2-CH3 (Tro, 975). Ethyl acetate is a suitable solvent due to its ability to undergo hydrolysis. Hydrolysis is the breaking apart of chemical bonds with the addition of water. Both oil and ethyl acetate are nonpolar in nature, whereas sand, CuSO4 and KNO3, are polar in nature. This separation of polarity allows for a natural separation of the substances to occur. Nonpolar

7.) Let the beaker sit on the hot plate for 3 minutes. 8.) Turn on the lab quest 9.) After a few moments put the temperature probe from the lab quest into the beaker.

One milliliter of 6.00-M phosphoric acid was placed into a 125-mL Erlenmeyer flask using a volumetric pipette. Using a slightly larger pipette, six milliliters of 3.00-M sodium hydroxide was transferred into a 50-mL beaker. Then a disposable pipette was used to slowly mix the sodium hydroxide into the phosphoric acid while the solution was swirled around. Then both the beaker and flask were rinsed with 2-mL of deionized water and set aside. A clean and dry evaporating dish was weighed with watch glass on a scale. Then the solution was poured into the dish and the watch glass was placed on top. The solution was then heated with a Bunsen burner to allow for the water to boil off to reveal a dry white solid. After the dish cooled to room temperature it was once again weighed and the new mass was recorded.

The purpose for this was so we could have a control group in our experiment. Next, we put each test tube in a different temperature ranging from ice water to boiling water. After completing this, we put test tubes one through four in the water bath that was at body temperature, thirty seven degrees Celsius. We then took them out to see if they were runny and if so, put them back in the water bath for ten minutes. After observing the test tubes the first time, only one test tube was completely solid.

Repeat the same experiment several more times (at least 4) to calculate the average amount of sodium hydroxide, which is required to neutralize the solution of vinegar.

In the final experiment we filled a dialysis bag with starch solution and tied off both ends of the bag so that it is water tight. We then filled a separate bag with sodium chloride and submerge both dialysis bags in two beakers of distilled water. We allowed the bags to sit in the water for 10 minutes. We then put silver nitrate into the water that held the dialysis bag filled with sodium chloride and recorded any changes in the water. We then added iodine to the water that held the dialysis bag of starch and observed any changes in the water.