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The purpose of this experiment is to determine the concentrations of two acids, hydrochloric acid, HCl, and ethanoic acid, CH3CO2H, by thermometric titration; and having done that, to calculate the enthalpy change of neutralisation.


You titrate both hydrochloric acid and ethanoic acid in turn with a standardized solution of sodium hydroxide and record the temperatures of the mixtures during the course of the titration. In each case a plot of temperature against time will enable you to determine the maximum temperature rise, from which you calculate both the concentration of the acid and the enthalpy change of neutralisation.


  • Safety spectacles
  • Pipette, 50.0 cm3
  • Pipette filler
  • Expand polystyrene cup
  • Sodium hydroxide solution , 1 m NaOH (standardized)
  • Thermometer, 0-50 C0 (in 0.1 C0)
  • Burette , 50.0 C0 cm3
  • Filter funnel , small
  • Hydrochloric acid , M  HCl
  • Ethanoic acid, M CH3CO2H

Safety/risk assessment: 
During experiment in laboratory extreme care should be taken to avoid any hazards. You should wear all the safety equipment at all times during the experiment.
Eye Protection: Make sure that your eyes are fully protected. Goggles should be worn at all times during the experiment in the laboratory.
Laboratory Coats: Lab coats should be worn during experiment to avoid damage to your clothes and skin.
Laboratory environment: Experiment should be taken place in a wide space and try to avoid having any unwanted stuff around you as it can come in contact with the chemicals and cause damage.
Handling Acids: 

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Sodium hydroxide: 

sodium hydroxide is very corrosive and can

  • Cause severe burns
  • Cause permanent eye damage
  • Be very harmful if ingested                                          

Hydrochloric Acid (HC l): 
HCl is very toxic and can cause following damage:

  • Concentrated HCl can form mists. Both the mists are solution have corrosive effect on human tissues.
  • Can cause damage your respiratory organs
  • Burn your skin severely
  • Cause damage to your eye sight if came into contact with eyes.
  • It can also ...

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