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Melting Point Lab

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In this lab, my lab group was able to test and verify all the parts of alum through a series of tests. We also were able to conclude whether or not the substance was alum after all. The testing of the alum, AlK(SO4)2, was able to conclude the melting point of alum, to determine whether sulfate was present in alum, and the water of hydration in the alum crystals. The melting point of alum was measured to be 92.5℃. This was tested by taking the alum and crushing it into a powder which was put into a capillary tube. The capillary tube was conjoined with a thermometer and heated. Once all of the alum disappeared from the capillary tube we recorded the temperature. On our first trial we recorded 100℃ Our second trial measured at 96C. The alum has a literature melting point at 92.5℃ so our results were in a fair range to assume our results were correct. …show more content…

To find my lab group’s ratio we took the leftover alum and placed it into a crucible and heated the crucible to figure out how much water had evaporated. We could use this later to determine the ratio. Before the crucible was heated, the mass we recorded of the crucible, cover, and alum crystals was 23.02g. Once the alum was heated everything was weighed again. We recorded that 22.34g was the new mass. This means that the mass of the anhydrous, AlK(SO4)2, was 0.75g and the water driven off was 0.68g. When my lab partners and I used these measurements for our calculations we got the ratio of 1:13. This ration is clearly accurate because the actual ration is

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