Experiment to Investigate the Effect of Heat of Neutralisation When The Acids Are Varied

Authors Avatar

Chemistry Coursework                                                                    Victoria James                            


Experiment to Investigate the Effect of Heat of Neutralisation When The Acids Are Varied

 I shall carry out several experiments investigating the heat of neutralisation when the acids and alkalis used are differentiated to see the different effects this has on the heat of neutralisation.


H+ + OH- =H2O

In my experiments I have decided to use the following acids and alkalis.








To investigate the effect different combinations that these acids and alkalis have I will use the following combinations:

Strong acid with a strong alkali (preliminary experiment) – HCl and NaOH

Strong acid with a strong alkali – HCl and KOH

Strong alkali with a weak acid – NaOH and CH3OOH

Strong monobasic acid with a strong dibasic alkali – HNO3 and NaOH

Strong dibasic acid with a strong monobasic alkali – H2SO4 and NaOH

Strong acid with a weak alkali – HCl and NH3



The 2molar acid/alkali to be used

Styrofoam cup

Electronic thermometer

100cc measuring cylinder

50cc measuring cylinder

3 250ml Beakers

Safety goggles  


1) Place polystyrene cup inside glass beaker

2) Measure out 50cm3 of the alkali in a 50cm3 measuring cylinder, and pour it into the polystyrene cup

3) Measure and record its temperature

4) Measure out 10cm3 of the acid in a 10cm3 measuring cylinder

5) Pour the acid into the polystyrene cup

6) Stir the solution

7) Measure and record the new temperature

8)Measure out another 10cm3 of the acid, and add it to the alkali

(This must be done quickly and accurately in order to prevent as much heat loss as possible)

9) Measure and record the temperature

10) Repeat this process until 90cm3 of the acid has been added

11) Repeat the entire experiment for each combination twice, and average out the temperatures

Fair test

Ensure all solutions are 2.0 moldm-3 -This is because solutions of different molarity would produce different results. This would therefore make the results incomparable. For this reason I must keep the molarity of each solution constant i.e.2M

Ensure all measured volumes of both acid and alkalis are accurate – As the acid has to be measured out and added to the alkali quickly, there is a possibility that the measurements may be made inaccurately. This should not be done, as this would mean that the volume at neutralisation would not be what you think it is. This obviously means that the heat of neutralisation that is calculated is not correct. For this reason, both the volume of alkali and acid should be measured to a particular degree of accuracy.

Join now!

Ensure all equipment is thoroughly cleaned before using them in the next experiment- If the equipment is not cleaned properly, any impurities left in cylinders etc., this could affect the results. If different alkalis and acids are mixed together, then the correct effects are not being measured.

Ensure the same polystyrene cup is used – Different polystyrene cups may have different levels of insulation. This would mean that some experiments would experience less heat loss than others, causing comparisons to be unfair and incorrect.



All neutralisation reactions have the same reaction, i.e. ACID + ...

This is a preview of the whole essay