Deicer Lab Essay

1883 WordsApr 17, 20138 Pages
Abstract Through three different experiments we were to find the quality of NaCl as a deicer. These experiments included testing the freezing point depression of NaCl in solution at two different concentrations, testing for the H of an aqueous NaCl solution, and combining NaCl with MgCl2 in an aqueous solution to test for freezing point depression. Through these various experiments we found NaCl to be the best deicer for our region due to its proficient freezing point depression and its cost efficiency. Introduction As scientists we were given the task to find the overall effectiveness of NaCl as a deicer. In choosing the best deicer we are comparing NaCl to KCl, MgCl2, and CaCl2. We believed NaCl to be the best deicer as it…show more content…
Results & Discussion Day One Results Trial | Volume H2O(ml) | Grams NaCl | Molarity of Solution | Final Freezing temperature(C) | Theoretical Change in Temperature(C) | 1 | 10 | 0.255 | 0.436 | -1.5 | -0.45 | 2 | 10 | 0.255 | 0.436 | -1.2 | -0.45 | 3 | 10 | 0.250 | 0.428 | -1.2 | -0.44 | 1 | 9.9 | 0.502 | 0.868 | -3.6 | -0.89 | 2 | 9.9 | 0.499 | 0.863 | -3.2 | -0.88 | 3 | 10 | 0.503 | 0.861 | -3.3 | -0.88 | Calculations for Day One Tf=(mass solute)(i)(molarity of solution) Sample Calc: (.512)(2)(.863)=.8837 Molality=mols solute/kg of solution Sample Calc: 0.499gNaCl/mm NaCl (58.44g)=.00854mol=> .00854mol/.0099kg=.863M Analysis Day One Through our data acquisition on day one our predicted values for the change in temperature of our NaCl solution in water was slightly off. This was most likely due to recording the freezing temperature sometime after the precise moment of the solution freezing. However, we predicted that as we doubled our concentration of NaCl in solution the freezing point depression would also double which is consistent with our results. Through our day one experiments we were able to better understand the ability of NaCl as a deicer by understanding how the freezing point depression changes based on concentration. We could further test these results by testing with different concentrations of NaCl. Day 2 Results Trial | Volume Room Temperature Water (ml) |
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