We found the mass of our pure alcohol to be 10.23g. The volume of our pure alcohol was 10.97mL. With these numbers, we used the formula mass/volume to find the density of our pure alcohol to be .9325g/mL. The percent error of our experiment was found to be 18.19% with an absolute error of .1435%. Conclusion:The purpose of this lab is to prepare and purify a fuel, ethanol C2H5OH.
Experiment Colligative Properties & Osmotic Pressure Karen Curry 1/19/2014 1:00pm Abstract The purpose of this experiment is to understand and compare the difference of the freezing points between pure solvents in a solution and a non-volatile solute. Secondly, osmosis is demonstrated in a permeable membrane in this case a dialysis tubing and a less permeable membrane with a much harder shell like the egg. Experiment and Observation Starting with Part I of this experiment I gathered together all my items I needed. Small rubber band, salt, tap water, distilled water, 1/8 teaspoon measuring spoon, crushed ice, beaker 100 mL plastic, stopwatch-digital, test tube 13 x 100 mm, digital thermometer, well plate-24. First I made a water bath by filling the 100 mL beaker with cool tap water.
The aspirator was turned to medium high, and then the copper was poured onto wetted filter paper. Using distilled water to remove all copper from the beaker. Once completely on filter paper 6mL of acetone was added to the copper to help dry it out. The filter paper was then removed and set down to dry completely. Once dry the filter paper was weighed with the copper on it and subtracted from the original weight to see the amount of copper left after
The silver nitrate test was conducted to test for the functional group of 2°and 3° alkyl halides as positive and negative controls were used. The silver nitrate test was conducted for a presence of the functional group alkenes and there were positive and negative control. The percent yield of dibromocholesterol collected was 91.98% and the percent yield of synthesized cholesterol collected was 140%. The percent recovery of the commercial cholesterol was 127%. This can only suggest there were some impurities in the synthesized cholesterol but other results prove it to be pure.
Allow the filter paper to dry overnight. 11. Weigh the filter paper with the contents inside. Record the weight. Data: | Fe | CuSO4 | Cu | FeSO4 | Filter Paper | Filter Paper with contents | Weigh Paper | Before | 1.445 g | 6.185 g | -- | -- | 0.770 g | -- | 0.29 g | After | -- | -- | 1.850 g | (drained out) | -- | 2.620 g | -- | Evaluation: 1.445 g Fe x 1 mol Fe x 1 mol Cu x 63.3546 g Cu = 1.64 g Cu => Theoretical Yield 55.847 g Fe 1 mol Fe 1 mol Cu 1.850 g Cu = 112.8 % => Percent Yield 1.64 g
INT Task 3 Problem Statement: The purpose of my experiment is to test the Mpemba Effect, which states that under certain circumstances hot water will freeze faster than cold water. Relevance of your testable question: This experiment is relevant in order to help specify the conditions under which the Mpemba Effect will occur. This experiment has been widely reproduced since its discovery in 1963 by Erasto B. Mpemba, but it’s still not completely understood. Literature Review: The first case study was taken from scienceoffcenter.org. The experimenter used 3 identical plastic cups and filled one with room temperature tap water, one with warm tap water and one with boiling tap water.
The MgSo4 absorbed the last traces of water the ether solution. The solution was completely dry when it appeared crystal clear and MgSO4 floated in the liquid, when swirled. If solution is cloudy, more drops of MgSO4 were to be added until solution was completely dropped. 5) We decanted the solution from the solid MgSO4 into a 50 or 100 ml round bottom flask. 6) The ether was removed using the rotary evaporator.
In this lab, two different titrations were performed with three different antacids to determine which brand is the most effective at the cheapest price. The antacids were ground up separately and approximately 0.2 grams of it was placed in a flask. Methyl Orange, an indicator, and a stir bar were added into the flask. The flask was then put on a stir plate which was under a buret with 0.1M hydrochloric acid. The acid was poured into the flask until there was a permanent pink colour.
c) If the percentage yield is 85.0%, what mass of precipitate is actually produced? d) How many moles of silver ions remain in solution? e) What is the concentration (M) of potassium ions that remain in solution? Problem 2 Ethanol (C2H5OH) reacts with permanganate ions in acidic solution to produce acetic acid and manganese (II) ions. Since this reaction involves a dramatic color change, it can be used in a titration experiment.
Recrystallise the crude ester from methanol using a quantity of hot solvent approximately twice the minimum required for complete solution (This is to ensure that the phenyl benzoate does not separate until the temperature of the solution has fallen below the melting point of the ester). Phenyl benzoate separates as colourless crystals. 5. Determine the melting point of the product. Results : Yield (mass in gram) = __________________0.128 g_____________________ Melting point of pure phenyl benzoate (OC) = ___________70O______________ Melting point of your phenyl benzoate (OC) = ___________69O______________ Questions : 1.