Enthalpy changes on displacement and the reactivity series.

To find the enthalpy change. ( I will go to the formulae later on in the plan).

Apparatus

I will use the following apparatus in the experiment:

• Beaker
• Measuring cylinder
• Thermometer  0-100
• Balance
• Weighing bottle
• Goggles
• Burette

Amount of substance

I will use 150 cm of copper sulphate solution. I will the use the following formulae to calculate the moles of copper sulphate which is:

                               Volume * concentration   = 100*1  = 0.1

                                              1000                       1000

I will measure the volume of copper sulphate. I am also going to calculate the mass of zinc by using the following equation:

Moles of zinc =   Mass. =    25  =  0.384 moles

                            RMM       65

 I will also record the initial and final temperatures of the solution and then re-weigh it.

I will then process the results that I obtain by firstly using the formulae M*C*   T, which will give me the energy gained by copper sulphate, this is given in joules. I will then also need to know the mass of copper sulphate which is equal to volume of CUSO4.  The “C” in the formulae above stands for the heat capacity which is 4.2, and the “   T” stands for the change in temperature, which we have recorded. Iw ill then convert my results in to kilo joules by dividing them by 1000, which then I will divide by the moles of copper sulphate or lead nitrate.

Safety

In this experiment I will need to use goggles to protect my eyes from any of the solution splashing out. Will also need to wear gloves because lead is poisonous and because the copper sulphate can be corrosive.

Accuracy of results

To ensure that my results are as accurate as possible I will repeat the experiment a number of times. I will also look at the measuring temperature more carefully so the readings are correct. I will use a bomb calorimeter instead of a beaker because it’s a much better insulter meaning less heat will be loss to the surroundings, and so my results will be much more accurate.