Post Lab 2 - compound Then we obtained the mass of the...

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Brian Hults Chemistry 1310/G2 Post Lab 2 Discussion 9/20/2009 In this lab we used the Law of Conservation of Matter to determine the identity of a certain unknown compound. The Law of Conservation of Matter states that through a chemical reaction, mass is not lost or gained. The mass that seemingly disappears is merely transformed into another state such as a gas instead of a liquid. By taking the hydrated substance and heating it repeatedly until all of its water had evaporated we were able to determine that the compound was most likely Copper (II) Chloride since the ending mass we obtained was very close to the molecular weight of Copper (II) Chloride. With the use of the Law of Conservation of Matter and careful calculations, practically any part of the chemical reaction can be figured out if it isn’t obvious to those observing the chemical reaction. We simply calculated the mass of the combined weight of the crucible and lid and then calculated them again with the sample
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Unformatted text preview: compound. Then we obtained the mass of the sample and after three heatings, we recorded the weight of the anhydrous sample. Concerning the experiment and calculations in the second part of this lab, we were able to deduce how to distinguish the presence of either Fe 2+ or Fe 3+ in a solution by exploiting the qualitative results from a particular chemical reaction between both Iron (II) and Iron (III), and Hydrous Copper Sulfate. The resulting chemical reaction will either leave the solution clear which means that it contained Iron (II), or the resulting solution will turn a bluish color which implies that Iron (III) was one of the reactants. These different results are due to the fact that in the Iron (III) resulting solution Copper Sulfate, which has a bluish color to it, is in excess because of the different mole to mole ratios of the two equations. This simple difference can be used to determine the presence of either Iron (II) or Iron (III) in the solution....
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