lab 10 - water. NH 4 NO 3 NH 4 + +NO 3-We found the molar...

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Experiment #10 Discussion The purpose of the experiment was to understand temperature, heat, and heat capacity. And to calibrate a calorimeter to measure the heat of metal, solution, and neutralization. Procedure: In part I we mixed hot and cold water in a calorimeter to find the heat capacity of the calorimeter. We found the heat capacity to be 28.9J. In part II we found the heat capacity of an unknown metal and used it to calculate the molar mass and figure out what the unknown metal was. We found the heat capacity to be .351J/Kg, meaning the metal was copper. Because the metal didn’t look like copper we concluded it was zinc. The actual heat capacity for Zinc is .389J/Kg. Our calculated atomic mass was thus, 71.23g/n, compared to the actual 65.39g/n. This error could be due to the fact that the zinc cooled before it was added to the calorimeter and before the first measurements we taken. This would cause the experimental atomic mass to be too low. In part III we found the calorimetric reading of ammonium nitrate mixed with
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Unformatted text preview: water. NH 4 NO 3 NH 4 + +NO 3-We found the molar heat of the solution to be 12031.2(kj/n), compared to the calculated 28600. This error is due to incorrect temperatures. The temperatures caused our molar heat to be less than half of what it should be. Had our temperatures had a difference of two or three more degrees, our molar heat would have been more accurate. I think our temperatures were off because we didnt put the thermometer into the calorimeter quickly enough after adding the ammonium nitrate. In part IV we found the heat of a neutralization reaction. We mixed HCl with NaOH. HCl+NaOHNa + +Cl-+H 2 O We found the heat capacity of the neutralization to be -56956.2kj/n compared to the actual -55830kj/n. The discrepancy is because of the change in temperature being too high, most likely because the initial temperatures we recorded as lower than they actually were....
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lab 10 - water. NH 4 NO 3 NH 4 + +NO 3-We found the molar...

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