Chem Lab Report Sample

Chem Lab Report Paper Introduction Matter that people encounter in everyday life consists of mixtures of different substances. Mixtures are combinations of two or more substances in which each substance retains its own chemical identity and therefore the original properties are maintained. The substances making up a mixture are called its components. According to our General Chemistry book, there are two types of mixtures; homogeneous and heterogeneous. Homogeneous mixtures are those that are uniform in composition, properties, and appearance throughout. Heterogeneous mixtures do not have the same composition, properties and appearance. Mixtures are characterized by two different properties: each of the substances in the mixture retains its chemical identity and mixtures are separable into these components by physical means, from heating, freezing, drying, etc. If one of the substances in a mixture exceeds the amounts of the other substances in the mixture you call it an impure substance and the other substances in the mixture are impurities. The preparation of compounds usually involves their separation or isolation from reactants or other impurities. The separation of the components of mixtures is based upon the fact that each component has different physical properties. The components of mixtures are always pure substances, either compounds or elements and each pure substance will possess a unique set of properties. Similarly, every crystal of a pure substance melts at a specific temperature and a given pressure, and every pure substance boils at a specific temperature and a given pressure. There are four different methods of separation depending upon differences in physical properties. They are declination, filtration, extraction, sublimation. We will write a custom essay sample on Chem Lab Report specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Chem Lab Report specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Chem Lab Report specifically for you FOR ONLY $16.38 $13.9/page Hire Writer In declination, a liquid is separated from a solid by gently pouring the liquid from the solid so the only the solid remains in the container. Filtration is the process of separating a solid from a liquid by using a porous substance (a filter). Filtration allows the liquid but not the solid to pass through, again, leaving behind the insoluble substance. Extraction separates a substance from a mixture by choosing to dissolve that substance in a suitable solvent (usually water). Sublimation happens when a solid passes directly to the gaseous state and back to the solid state without passing through the intermediary liquid state. Material and Methods Evaporating Dish Beaker 3. 0 Grams of mixture (Enoch ammonium chloride, Nasal sodium chloride, Isis silicon dioxide) Heat plate Balance Oven Stirring rod 15 ml water x 2 = 30 ml water Obtain mass of evaporating dish. 2. Add 3. 0 grams of mixture (NICE ammonium chloride, Nasal sodium chloride, Isis silicon dioxide) to the evaporating dish and weigh to obtain mass of evaporating dish and sample mixture. 3. Subtract mass of evaporating dish from mass of original sample to get mass of original sample. 4. Place dish with sample onto heat plate to sublime the Enoch. 5. Remove from heat to cool mixture then weigh again. The difference in mass of evaporating dish and sample prior to heating and after heating represents the amount of Enoch in the mixture. 6. Obtain mass of beaker using the balance. 7. Add 15 ml of H2O to the mixture in the evaporating dish and stir gently 8. Decant the liquid into the beaker making sure not to transfer any of the solid into the beaker. 9. Add another 15 ml of H2O to the mixture in the evaporating dish and stir gently. Decant the liquid again into the beaker making sure not to transfer any of the solid into the beaker to extract Nasal. 0. Place beaker with sodium chloride solution onto heat plate and heat until water evaporates. Remove from heat and allow to cool. Weigh beaker. Difference between this weight and the weight of the empty beaker is the amount of Nasal in the mixture. 11. Take evaporating dish with Isis and heat until dry in oven. Once dry, remove evaporating dish from oven and allow to cool. Obtain the mass of Isis by weighting the evaporating dish with cooled mixture and subtracting mass of empty evaporating dish obtained earlier. 12. Find percent of Enoch, Nasal, and Isis in mixture by taking mass of each substance and viding by the mass of the original sample. Results: Separation of the Components of a Mixture A. Mass of Evaporating Dish and Original Sample 41 . 606 g Mass of evaporating dish 38. 859 g Mass of original sample 2. 747 g Mass of evaporating dish after subliming NICE 41. 466 g Mass of Enoch 5. 096 % 0. Egg percent of Enoch % Enoch = 0. Egg/ 2. 747 100% = 5. 096 % B. Mass of Evaporating Dish, Watch Glass and Nasal 106. 521 g Mass of evaporating dish and beaker 1. 307 g Percent of Nasal Niacin = 1. 307 g/ 2. 747 g* 100% = 45. 32 % C. Mass of Evaporating Dish and Isis 105. Egg Mass of Ana 45. 32% % 40. 04 g Mass of 38. Egg Mass of Isis 1. Egg percent of Isis = 1. 245 g / 2. 747 g* 100% = 45. 322 % D. Mass of Original Sample determined (Enoch + Niacin + Isis) weights 45. 322% % Isis 2. 747 g Mass of 2. 692 g Differences in these 0. 055 g Percent recovery of matter 97. 997% % recovery of matter = 2. Egg /2. Egg = 97. 997 % Account for our errors about 2% Discussion The first step in the experiment required using the oven to heat th e mixture, with ammonium chloride, sodium chloride, and silicon dioxide in the evaporating dish, until white fumes were no longer form[De], according to the lab description. The goal was to sublimate the ammonium chloride, as it is not water soluble. It took about fifteen minutes to sublimate the Enoch. The dish had to cool as well when it came out of the oven. The mass of the dish contents were weighed and subtracted from the mass off the starting mass of the dish and the original mixture. The result was the loss of NICE. Errors could have resulted from incorrectly weighing the original and ending samples. If ample time was not given to the sublimating process, Enoch may not have completely left the dish, the weight would not just include the mass of the other two substances. The next stage required careful declination and stirring to remove only the liquid into a separate dish. The goal was to leave behind the insoluble substance, sand, and pour off the soluble Nasal. It was possible to accidentally remove particles of sand into the solution, which would influence the mass calculation of the two dishes. If stirring was not rigorous enough and water was not repeatedly added to sort out the sand from the liquid, there was a potential for sand staying behind as well. The final stage was to use the heating unit to evaporate the water from the solution to leave behind Nasal. At the same time, the heating unit was used to dry the sodium chloride in another dish. A calculation was made between the mass of the empty evaporating dish and the watch glass to reveal the mass of Nasal. Errors at this stage probably resulted from inaccurate readings on the scale or not drying the samples completely. The final stage of the experiment was to isolate the sand and calculate its mass. By this late stage, any errors in measurement, timing and calculations would have trickled down to the final remaining substance. The percentage of accuracy of the three components in the experiment should total 99%. If the percentage was less than that, you have been sloppy according to the lab manual. Conclusion In this experiment, it became apparent that what appears to be a simple mixture of elements is really more complicated. Heterogeneous mixtures may appear to be random collections of single substances, but when they are sorted into their components, the homogeneous elements can be observed. This was the case with this experiment. The original mixture had three substances: Nasal, Enoch, and Isis. By using four methods, declination, filtration, extraction, and sublimation, the separate components in the mixture could be isolated and sighed.