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Enthalphy of reaction lab report

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Introduction

Aim: To determine quantitatively the enthalpy of reaction between copper(II) sulfate and zinc metal. Qualitative Observations: Red flakes were seen on the stirrer and the bottom of the copper calorimeter. The solution turned colorless. Heat energy was liberated Data Collection Time t/s ât= ±0.01s Temperature T/ °C âT= ±0.2 °C 0.5 32.0 1.00 38.0 1.50 45.0 2.00 48.0 2.50 50.0 3.00 51.0 3.50 54.0 4.00 57.0 4.50 59.0 5.00 59.0 5.50 59.0 6.00 59.0 6.50 59.0 7.00 58.0 7.50 58.0 8.00 58.0 8.50 57.0 9.00 57.0 9.50 56.0 10.00 55.0 10.50 55.0 11.00 54.0 11.50 54.0 12.00 53.0 12.50 53.0 13.00 52.0 13.50 51.0 14.00 51.0 14.50 50.0 15.00 50.0 15.50 49.0 16.00 49.0 16.50 49.0 17.00 48.0 17.50 48.0 18.00 48.0 18.50 47.0 19.00 47.0 19.50 46.0 20.00 46.0 Volume of CuSO4 taken (V) ...read more.

Middle

= m×c×âT = 25×4.184×38 = 3974.8 Joules = 3.974 kJ Uncertainty in Q (âQ) = = ± 0.116% ≈ ±0.0046 kJ Molar enthalpy of reaction (âH) = Q/n n = concentration of solution(c) × Volume of solution(v) = 0.1×25/1000 = 0.025 moles âH = Uncertainty in âH = 0.116% ≈ ±0.184 Conclusion and Evaluation The value of the molar enthalpy of the reaction of copper sulfate and Zinc was found out to be (158.99 ±0.184) Some of the heat loss was accounted for by extrapolation of the graph however the theoretical value is 217 Percentage Deviation from Literature value = ≈ 26.73% This deviation is due to a number of system and random errors. ...read more.

Conclusion

Some heat exchange might have taken between the two. There was a parallax error while taking the reading of the measuring cylinder. Error Correction A pipette should have been used instead of the measuring cylinder as this would ensure less sticking of copper sulfate to the vessel and greater accuracy. A Styrofoam or a glass calorimeter should have been used which would not react with the solution or zinc. The inside of the calorimeter should have been coating with a reflecting paint as this would reduce heat loss by radiation. More readings should have been taken to reduce random error. The initial temperature of copper sulfate should have been taken when it was in the calorimeter. A plastic stirrer should have been used as it would not react or conduct the heat leading to any heat loss. ...read more.

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