Materials: 3 beakers Thermometer 3 Alka-Seltzer tablets Stopwatch Mortar and pestle Source of hot water Ice cubes Graph paper Procedures: Hot water- Run water from the hot tap until it is hot as possible Fill beaker with 80 mL of hot water Use thermometer to take temperature of water. Record in data table. Remove 1 Alka-Seltzer tablet from package Drop into the water. Measure the time it takes for the tablet to completely dissolve. BE READY WITH THE STOPWATCH.
Samantha Monette Lab Section E Wednesday 10:00-12:50 p.m. Bromination/Debromination of Cholesterol Abstract: The purpose of this experiment was to purify commercial cholesterol. The commercial cholesterol was brominated using bromine as the reagent. After the compound was cooled and vacuum filtrated, dibromocholesterol was obtained. To purify the dibromocholesterol, zinc was added as the reagent. After a series of washes to remove any impurities, the compound was dried and decanted, cholesterol was synthesized.
Write down everything you notice. Remove test tube from water and allow it to cool for 2 minutes in a small beaker of tap water. Add about 7.0 mL of 1M hydrochloric acid to the tube. Mix chemicals very thoroughly with a stirring rod. Record how long it takes for change to happen.
The column is now ready for the addition of the mixture to be separated. 2.) Separation of the Fluorene and 9-Fluorenone Mixture: Accurately weigh 0.1g of the 1:1 mixture of fluorene and 9-fluorenone mixture, place it in a small test tube, and dissolve it in 0.5mL of petroleum ether. Add a few drops of dichloromethane, just enough to effect solution. Transfer the solution to the top of the column with a Pasteur pipet.
Examine the effect of heat on the solubility of albumin B. Examine the effect of pH changes on the solubility of albumin and casein C. Examine the effects of 95% ethanol, lead(II) nitrate, silver nitrate, and tannic acid on albumin and casein Procedure A. The effect of heat Place about 1 mL of 2% albumin in a test tube and heat it in a hot water bath for a few minutes. Compare the appearance to the albumin solution at room temperature. B.
B.Pt: I poured rubbing alcohol in a beaker and rubber banded it with the thermometer. I logged the last bubble that came out of the capillary tubes. After that I crushed the acetamide and carefully put it in the capillary tube I banded it to the thermometer and logged when the acetamide. 2. M. Pt: I put gloves on and inserted acetamide into the end of the 2nd capillary and moved the powder towards the end of the tube and repeated it until it was ¾ quarters down.
And limiting reagent which is the reactant that is completely consumed when a reaction is run to completion. III. Summary of Procedure In this lab the first procedure was to measure the initial temperature of NaOCl and of Na2S2O3 and measure it with a thermometer and then record it. The same thermometer is used for measuring both solutions, but the thermometer should be washed with distilled water after the using it in one solution. Afterwards a small amount of NaOCl was added to the graduated cylinder.
UNCW Honors Chemistry Lab #1- Laboratory Safety and Boiling Water Date Started: 8/26/11__________________ Date Completed __________________ Purpose: To determine the temperature at which water boils. To learn how boiling and melting are physical changes. Background Information/Observations: 1) Explain the most common scenario when you observe water boiling. 2) Explain how you could change the rate at which water boils. 3) Explain how you could change the temperature at which water boils.
Allow the precipitate to settle, and heat 30 mL distilled water. Weigh, fold and place two filter papers into funnels and seal with distilled water. Decant a 50 mL sample from each beaker of solution into two other beakers. Pour the rest of the solutions into the respective funnel filters, and make sure to wash all precipitate into the filter, using the heated distilled water. Remove and air dry the filter papers containing the precipitates.