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
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.