代做Determine enthalpy change of single displacement reaction between zinc and copper sulphate帮做R程序
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Introduction:
Zinc is placed at a higher position in the activity series compared to copper. Hence zinc can displace copper from a solution of copper sulphate. During this displacement reaction, heat evolved can be calculated in kJmol-1. The amount of heat evolved can be used to determine the relative position of metals in the activity series.
Chemical: |
Apparatus: |
|
Styrofoam cup with lid |
Zinc powder (1.0 g) |
Temperature probe |
1.0 mol.dm-3 copper sulphate solution |
25.0mL volumetric pipette |
Preparation: Write a balanced equation for this displacement reaction. |
Procedure:
· Pipette 25.0mL of 1.0 mol.dm-3 CuSO4 into a styrofoam cup.
· Weigh around 1.0 g of zinc powder and record the exact mass.
· Put the temperature probe through the hole in the lid, stir and record the temperature to the nearest 0.1oC every half minute for 2.5 minutes.
· At precisely 2.5 minutes, add the zinc powder to the cup.
· Continue stirring and record the temperature till there are at least 5 readings where the temperature has dropped from the previous reading.
Data Collected
Analysis
1 Calculate the heat of the reaction by using q = mcDT,
c = 4.18 Jg-1°C-1 and DT is the change in temperature.
1 Convert the heat of the reaction (in joules) to kJ mol–1 of limiting reagent
2 Show the propagation of uncertainties in your calculations
Discussion:
Evaluate your experiment. What assumptions did you make?
The literature value for this displacement reaction is -218kJmol-1. Calculate the % error and mention some sources of error and how precise (replicable) your results were. (the class results)