Featured in PASCO’s Chemistry through Inquiry Teacher Guide

Chemistry through Inquiry Teacher Guide

(PS-2871C)

Features over 25 inquiry based labs covering the fundamental concepts of lab skills, structure & properties of matter, chemical reactions and more.

Heat of Reaction & Solution

Lab Summary

Use a temperature sensor to determine the molar heat of solution for sodium hydroxide and ammonium chloride when they are dissolved in water, and the molar heat of reaction when magnesium reacts with hydrochloric acid.

 

Theory

Determine the molar heat of solution for sodium hydroxide and ammonium chloride when they are dissolved in water, and the molar heat of reaction when magnesium reacts with hydrochloric acid. Through this investigation, students:

  • Calculate the molar heat changes ΔH in physical and chemical processes.
  • Review exothermic and endothermic processes.
  • Write equations that show the molar heat changes in physical and chemical processes.

Method

Students will conduct the following procedures:

  • Record temperature versus time data for ammonium chloride dissolving in water, for sodium hydroxide dissolving in water, and for magnesium metal reacting with hydrochloric acid.
  • Analyze the temperature versus time data to determine the change in temperature after correcting for heat loss.
  • Calculate molar heat (enthalpy) changes and compare them to accepted values.

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:

Beaker, 250-mL 
Graduated cylinder, 50-mL 
Balance, centigram 
Polystyrene cup - 2
Spatula 
Stir rod 
Paper towels - As needed
Weighing paper 
Sand paper or steel wool - 1 piece
Wash bottle and waste container 
Sodium hydroxide pellets - 1 g
Ammonium chloride - 1 g
Magnesium metal ribbon - 0.10 g
1.0 M Hydrochloric acid - 25 mL
Distilled (deionized) water - 50 mL

Your Bundle Options:

Option 1:

Chemistry Starter Sensor Bundle

(PS-2921)

A sensor bundle specifically designed to get you started using probeware in your chemistry lab. Also: perform 22 Lab Activities from Chemistry through Inquiry teacher guide.

Option 2:

Chemistry Standard Sensor Bundle

(PS-2927C)

Contains the sensors and probes needed to perform all 17 experiments in the Advanced Chemistry Teacher Guide and all 25 labs in the Chemistry through Inquiry Guide.

Interface Required

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