The determination of the enthalpy of neutralization

Materials and methods for experiment 13

The determination of the enthalpy of neutralization

100.0 ml of 1.00 M HCl solution, 100.0 ml of 1.00M NaOH solution, a digital thermometer, beakers, and graduated cylinders, and a calorimeter that consisted of aluminum and Styrofoam vessels with a lid featuring two openings, a temperature sensor equipment which includes a laptop with PASCO Capstone software installed, a stir plate attached to a pole using a mini clamp, a stir bar and tweezers were used in this experiment.

A 100.0 mL sample of 1.00 M hydrochloric acid (HCl) solution was added to a calorimeter positioned on a stir plate. The temperature sensor and a clean stir bar was then placed into the calorimeter containing the HCl solution. The solution was then stirred at 600 rpm. Meanwhile, 100.0 mL of 1.00M NaOH solution was prepared, and its temperature was measured using a digital thermometer. The NaOH solution was added to the calorimeter containing the HCl solution. The temperature readings inside the calorimeter were recorded and monitored on a laptop using Capstone software. The final temperature was noted when the readings stabilized and reached a plateau. This experiment was conducted in two trials.

Prior to stirring, the position of the stir bar was adjusted to ensure it did not touch the temperature sensor. Before proceeding with the second trial, the beaker in the calorimeter was rinsed twice with tap water to reach ambient temperature, ensuring the accuracy of the second trial's temperature. Then, it was rinsed once with distilled water to remove any remaining solution that could affect the result of the second trial.

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