• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Experiment to find out the enthalpy changes that took place for the reaction between copper sulphate and zinc.

Extracts from this document...


Evaluation I conducted an experiment to find out the enthalpy changes that took place for the reaction between copper sulphate and zinc. An enthalpy change of a reaction is the heat exchange with the surroundings at constant pressure. Introduction In this experiment in order to find out the enthalpy change I shall be reacting aqueous copper sulphate with zinc. In this reaction Cu is being reduced and Zn is being oxidised. In this experiment the enthalpy change is exothermic. Enthalpy changes can be both exothermic and endothermic. Exothermic reactions are easily recognised by a rise in temperature. Endothermic reactions require an energy input. Enthalpy is the total energy content of the reacting materials it is given the symbol H. Enthalpy cannot be measured but it is possible to measure enthalpy change when energy is transferred to or from a reaction system. Enthalpy change is given the symbol ?H where ? ...read more.


?H = 4.18Jg * 50g * 16.5�C = 3448.5J You then need to divide this by the no of moles of zinc used to get the overall enthalpy change. Moles= mass = 2.106 = 0.032 Ar 65.4 3448.5 = 107765 0.032 107765 = 107.77KJ 1000 The overall enthalpy change given out by this experiment is 107.77KJ Limitations and Improvements There were two main limitations in this experiment, mainly the cup and the thermometer. The limitation of the cup was that it was not too well insulated so heat energy was lost more readily to the surroundings. Also there was no top so heat could have escaped through the top. The limitation with the thermometer was the range. By this I mean, when I took a temperature reading the closest I could get was 0.5, i.e. 21.5 31.5. If I had a better range on the thermometer I could get better, more accurate readings. ...read more.


Also I could have had a colorimeter, which could have shown me when the reaction ended. This could have helped me because it would have been a point where I would have recognised when the temperature would start to fall. Another improvement is that I could have done the experiment again and gain another set of results to compare with my original results. Errors and anomalous results. The errors that occurred in this experiment are as follows. When I took a temperature reading my body heat may have interfered with the temperature. Also due to the lack of range on the thermometer I had to use my own guesswork as to what the temperature was when it was between two whole numbers. Also the experiment was not very efficient. By this I mean that a lot of energy was lost to the surrounding as there was a lack of insulation. If you look at my results you will see that there are not any anomalous results. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Organic Chemistry section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Organic Chemistry essays

  1. Marked by a teacher

    Experiment to Determine Acidities of Wine. The purpose of this experiment is to ...

    5 star(s)

    = Total Acidity - Fixed Acidity = - 3.548�10-2 = 6.72x10-3 mol l-1 South African It took 17.1cm3 of NaOH to reach the equivalence point of pH 8.2. so the number of moles of NaOH needed for this is given by: Since 1.640x10-3 moles of NaOH reacts with 8.20x10-4 moles

  2. Marked by a teacher

    Reactions of aldehydes and ketones. The purpose of this experiment is to compare ...

    5 star(s)

    Cr2O72- Cr3+ Besides acidified dichromate solution, acidified potassium permanganate solution can also be used as an oxidizing agent. The equation of its reduction is: MnO4- + 8H+ +5e- Mn2+ + 4H2O However, this oxidation test cannot be used to confirm that the sample is a aldehyde as there are also

  1. Preparation of haloalkane. The purpose of this experiment is to prepare 2-chloro-2-methylpropane from ...

    The percentage of the final yield was just an average of some groups, which did not necessarily mean that the fraction of cyclohexene in our group's product was . There might be some error in this part of the calculation.

  2. Determination of the formula of Hydrated Iron (II) Sulphate crystals

    Procedural uncertainties and improvements: There are a number of procedural uncertainties for method one including the fact that the procedure of heating the iron (II) sulphate to drive off the water is only done twice. The problem with this is that because it is not reheated and weighed continuously until

  1. Find the enthalpy change of combustion of a number of alcohol's' so that you ...

    189.87 188.34 1.53 17.5 37.5 20 Butan-1-ol Trial 2 200 124.45 121.46 2.99 17.5 37.5 20 Butan-1-ol Trial 3 200 211.39 209.63 1.76 16 36 20 I am going to use the following formula to work out how much energy in form of heat was transferred to the water in

  2. The aim of this experiment is to produce Aspirin. This is an estrification in ...

    A clean beaker was rinsed with distilled water and the solid was transferred from the weighing bottle into the beaker. The weighing bottle was rinsed three times with distilled water, transferring the washings each time. This was done to ensure that the entire solid goes into the beaker.

  1. Comprehensive and Detailed Chemistry notes

    + H2O (l) H2SO3 (aq) Sulfurous acid then reacts with oxygen; this is catalysed by air particles: 2H2SO3 (aq) + O2 (g) 2H2SO4 (aq) Nitrogen dioxide also reacts with rain, making nitric and nitrous acids: 2NO2 (g) + H2O (l) HNO3 (aq) + HNO2 (aq)

  2. Compare the enthalpy changes of combustion of different alcohols

    This will be the peak temperature. When the temperature change has been achieved I will close the cap which avoids any excess fuel evaporating into the atmosphere. 11) Once the burning has finished I will weigh the spirit burner to determine the mass of alcohol that has been used up.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work