Featured in PASCO’s College Chemistry Instructor Guide

College Chemistry Instructor Guide

(PS-3803A)

College Instructor edition with 36 experiments covering introductory and general chemistry topics.

Enthalpy of Chemical Reaction

Lab Summary

Use a stainless steel temperature sensor to derive the enthalpy change of a reaction.

Theory

Students use Hess’s Law to calculate the enthalpy change of a reaction between ammonia and hydrochloric acid in aqueous solution.

Method

Students gain experience conducting the following procedures:

  • Carrying out and monitoring the temperature change of 3 reactions.
  • Comparing the results of the enthalpy calculated from the heat of reaction to that calculated using Hess’s Law.

Sensors / Equipment Used:

PASPORT Chemistry Sensor

(PS-2170)

Allows students to measure Temperature, pH/ISE/ORP, Absolute Pressure & Voltage in one sensor. For use with PASPORT Interfaces.

Materials Used:

Polystyrene cup, 8 oz.
Clamp, utility 
Beaker, 250-mL 
Graduated cylinder, 50-mL or 100-mL 
Ring stand 
2.00 M Sodium hydroxide (NaOH) - 50 mL
2.00 M Hydrochloric acid (HCl) - 50 mL
2.00 M Ammonium chloride (NH4Cl) - 50 mL
2.00 M Ammonia (NH3) - 50 mL

The Associated Bundle:

Advanced Chemistry Standard Sensor Bundle

(PS-2928A)

Contains the probeware for completing experiments in the College Chemistry lab manual.

Interface Required

This experiment may require software and an interface for data collection.