Enthalpy. This experiment's aim is to find out, enthalpy change of a reaction, and to determine whether it is exothermic or endothermic.

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Lab report on Emthapy

Aim :

This experiment's aim is to find out, enthalpy change of a reaction, and to determine whether it is exothermic or endothermic.

Apparatus :

Measuring Trays                        

Weighing Scale

Citric acid

Sodium Carbonate

Polystyrene cup

Thermometer

Reaction beaker + lid

Copper Sulphate

Zinc (powdered)

Stopwatch

Method:

  1. Pour 25 ml of Copper Sulphate into the reaction beaker.
  2. Place the reaction beaker in the polystyrene cup and put the thermometer in the cap.
  3. Record the temperature of the solution.
  4. Add the 0.5 grams of Zinc powder and close the lid immediately.
  5. Record Maximum change of temperature.
  6. Repeat steps 1 – 5 but this time use citric acid in place of Copper Sulphate and 3 grams of Sodium Carbonate instead of zinc.
  7. Calculate energy change for the amounts of substance used.
  8. Calculate the amount of the reactant in solution in the cup.
  9. For each reaction calculate energy change per mole of the reactant which was in solution at the start.
  10. Write a symbol equation for the first reaction and a word equation for the second one.
  11. Write the energy change per mole of citric acid.
  12.  Draw an energy level diagram for the enthalpy change of both reactions.
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Diagram of Apparatus:

Results:

Starting temperature:

Final temperature:

Observations:

There were two different levels of reactions, The 1st reaction did not fizz to much, the 2nd  had a rather vigorous reaction, as soon as the reactants were mixed.

Conclusion:

The results show that the first reaction, which gave out heat to its surroundings, was exothermic, and the second reaction, which took heat from its surroundings, was endothermic. After this has been established, a few more things may be noted.

Firstly, we know that ...

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