I then allowed the remaining liquid to evaporate leaving behind salt. I poured the salt into the weighing dish and weighed the mass and calculated and recorded into table 1. Data Table 1: Experiment Data Grams Percent of Mixture Iron Fillings 0.9 gm 19.6 % Sand 1.4 gm 30.4 %
The mixture was decanted again in to the same beaker. Next, we added boiling chips to the liquid and evaporated the solvent over the hot plates under the hood. After the solvent was evaporated and the flask was cooled, we used a spatula to remove a small amount of the crude product and took its melting point. We determined the melting point range of the sample to be 43.0-46.0 degrees Celcius.The crude product was yellow colored when it was warm and orange in color when cooled and sticky. We then recrystallized our sample using 5 ml of warm acetone that was heated on a hot plate under a hood.
To obtain the caffeine, the methylene chloride was removed from the extract, leaving us with our solid caffeine residue. Sublimation: We purified our solid caffeine through sublimation. By constructing a side-arm test tube apparatus, we vaporized and condensed the caffeine using a Bunsen burner. Upon cooling, the apparatus was carefully disassembled and the sublimed caffeine was scraped off of the test-tube collection surface and weighed. The melting point range was then determined by utilizing a melting point apparatus.
Boil at least 10 minutes. 7. While the metal is still in the boiling water bath, measure the temperature of the boiling water carefully with a thermometer and record to tenths, one decimal place, in Data Table 2 8. After the metal has been heating 10 minutes, remove the metal from the boiling water bath using the string. Immediately transfer the metal into the calorimeter cup so that the water covers the metal.
Gently stir the pellets until the acid is dissolved by shaking the the apparatus. Lift the calorimeter lid and wash out its contents and the thermometer. Repeat this experiment using 50.0 mL of 1.0M acetic acid. Repeat experiment using 25.0 mL of each 2.0M sodium hydroxide and 2.0M acetic acid. Data Table(s): Reaction equation Mass of solid NaOH Initial Temp.
Purpose: To determine and execute the separation of mixture of solids through different means. Examples are magnetisms, evaporation, and filtration. Proposed procedure: Start with the mixture, remove iron by using the magnet, then you are left with NaCl, Benzoic acid and sand. Add water to the mixture, and heat it up and pour the liquid from the sand by filtering it out, lay the sand out to dry, funnel out the benzoic acid and the final liquid will contain NaCl and I would heat it to have the water evaporate. Procedure: Followed the steps in the lab manual to conduct each separation.
Specific Heat and Phase Changes Introduction: In these labs, we are learning mainly about the transfer of energy. In the Specific Heat lab, we learn about a metal and water’s ability to conduct and transfer heat/energy. What we did is drop the metal in water that is room temperature until the water+metal solution reaches its highest point in temperature. The second lab, we are dropping ice in coffee and watching the what happens along with the temperature. Also, we watched as the water boiled and made observations as the temperature as it started to boil.
Stirred the mixture to make sure all soluble material dissolves. 10. Poured the liquid while it is hot into a small paper cup. 11. Poured another 10 to 15mL of distilled water into the beaker containing the sand, brining the mixture to a boil and decanted again into the same cup used previously.
Materials and Methods Materials The compounds used in this lab are listed in the table below: Procedure We boiled 2 NoDoz tablets in grinded form with 60 mL of water in a 100 mL beaker and allowed it to cool to room temperature after it had been sitting on the hot plate for 5-10 minutes. Next, we performed a hot gravity filtration by pouring the hot aqueous solution of water and NoDoz (caffeine and insoluble binder) through a large Buchner funnel into an Erlenmeyer flask. We discarded the collected insoluble binder collected inside of the Buchner funnel and performed an extraction by mixing the aqueous solution collected in the Erlenmeyer flask (aqueous solution of water and caffeine) and 15 mL of methylene chloride in a separatory funnel and swirled until the layers had separated to form an aqueous layer on top and an organic layer containing the solvent and caffeine at the bottom of the funnel. We drained the lower layer into an Erlenmeyer flask and repeated the extraction. Next, we added anhydrous sodium sulfate to the Erlenmeyer flask, which contained the combined organic layers of the 2 extractions,