Nest two Styrofoam cups within one another 2. Turn on magnetic stirrer 3. Insert probe into cardboard lid 4. Pour 25mL of water into calorimeter 5. Determine initial temperature of water 6.
When the pipet was half emptied into the ice water a timer was started. This aliquot was the first sample taken at t=0. The sample was rapidly titrated with 0.100 M HCl to a phenolphthalein endpoint and the final volume was
Place the test tube, with the zinc in it, in the water and continue heating. 5. Fill the Calorimeter with the water to 45mL, measuring the amount of the water in the Calorimeter. 6. Record the temperature of the water in the Calorimeter and the temperature of the boiling water.
Cool the beaker in ice water for 10 min, with stirring, and collect the solid by vacuum filtration on a small Hirsch funnel. Rinse with three small portions of water, by breaking the vacuum, adding just enough water to cover the solid, and reapplying the vacuum as before. Filtration of the fine crystals is slow. Using too much rinse water will slow the process considerably. Allow the solid to dry at least overnight, weigh it, take a MP, and calculate the % yield.
After heating, the mixture was cooled to room temperature and filtered by vacuum filtration into a fritted funnel to yield a purple product. The product was washed 3 times with (5mL) portions of chilled 6M HCL, then Ethanol, and lastly with acetone. The resulting product was placed into a vial and left to dry in a vacuum desiccator for 1 week and weighed the next week. The yield was 6.029g. The second experiment, procedure 1, combined [Co(NH3)5 (H2O)]Cl2 (0.0060M, 1.52g) and (25mL) of distilled water to an 125mL Erlenmeyer flask.
Purpose: The purpose of this experiment is to measure the rate of increase (slope) of the water given two different starting points to the boiling point of 212 degree Fahrenheit in the span of time. The rate of increase in water temperature as it is heated given all control variables are the same such as one quart aluminum pot holding three cups of refrigerate and room temperature water. The study is to conduct weather if both types water will have the same slop of increase. Procedure: The first step was to fill a jug full of water and leave it in the fridge to cool down overnight and another jug full of water so that it becomes part of room temperature. Before the experiment, take out the fridge water and measure out three cups and pour it into the one quart pot and measure the water temperature before placing it on the stove.
The third test will utilize thin layer chromatography to evaluate the purity of the aspirin as well as testing for the presence of leftover salicylic acid or other by products of the reactions. Experimental: Week 1: For the synthesis of the aspirin, 250 mL of water was boiled. 1.5 g. of salicylic acid were poured on a test tube. Then, 3.5 mL of acetic anhydride and four drops of 85% phosphoric acid were added. A cotton ball was placed to prevent vapor escape.
Measure and record the mass of the test tube and metal. 5. Place the test tube containing the metal into the beaker of water and continue heating (10 min). Leave the test tube in the boiling water bath while you complete steps 6 and 7. 6.
5mL of acidified water will be measured, using a graduated cylinder, and will be transferred to the R tube, and will be immediately vigrously mixed with the reactants. Once the solution turns to an orange or red-brown color, a pipet will be used to quickly remove 30 drops of the solution, then transferred to the C tube, and the mixing will resume until the solution is close to room temperature. The solution will be filtered into the P tube, and the solution that is left in the R tube should be washed three times with 1mL of acidified water each time. The water should then be poured into the P tube, leaving the solid in the R tube. Using a test tube holder, heat the R tube over the Bunsen burner, moving the tube in a circular motion until all the water has evaporated.
The watch glass was removed with the beaker tongs. Using a rubber bulb and a stirring rod to stir the solution continuously, 15.00mL of .25M BaCl2 solution was added to the solution in the beaker. The watch glass is replaced and the solution is keep hot but not boiling for 15 minutes. The precipitate was allowed to settle. When the liquid above the precipitate was clear, the solution was tested for completeness of precipitation when a few drops of BaCl2 solution were added from a pipette.