THERMOMETRIC TITRATION
CHEMISTRY COURSEWORK THERMOMETRIC TITRATION Aim 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. Introduction 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. Requirements * 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
To investigate the effect of temperature on the rate of reaction
Title: To investigate the effect of temperature on the rate of reaction. Objective: To study on how temperature relates to the rate of reaction. Procedures: . 5cm3 of the hydrochloric acid is added to a boiling tube. 2. 20cm3 of the sodium thiosulphate solution is added to another boiling tube. 3. Draw a large cross on a piece of paper* and a beaker is placed over it. A heat-resistant mat is put under the paper. (*In the experiment, the heat-resistant mat is directly drawn with a cross, so that we did not need to draw it on a sheet of paper.) 4. Another beaker which contains water is prepared. 5. The two boiling tubes are put inside the beaker for a hot water bath, both with a thermometer*. In the first time of the experiment, this step is skipped because the experiment is done in room temperature, but a thermometer is still put into a boiling tube to measure the temperature. (*In the experiment, we have only got one thermometer so we measured the temperature of the water bath.) 6. After both of the solutions reach the suitable temperature, they are poured into the beaker which is prepared in step 3. Start the stop watch simultaneously. 7. The solution is stirred*. A person watches the cross vertically during the reaction. (*In the experiment, we did not stir the solution.) 8. Stop the stop-watch when the cross on the paper just 'disappeared'. 9. Record the time