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.

Le Chatelier's Principle

Lab Summary

Use a pH sensor to determine the effect of concentration changes on the equilibrium of a system, relating pH values with the acid-base indicator
phenolphthalein.

Theory

Determine the effect of concentration changes on the equilibrium of a system. Through this investigation, students:

  • Use Le Châtelier’s principle to explain observed changes and to make predictions.
  • Relate pH values with the acid-base indicator phenolphthalein.

Method

Students conduct the following procedures:

  • Determine the pH of a variety of solutions.
  • Predict the shift in equilibrium when concentrations of specific reactants or products are changed.

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, 100-mL - 2
Beaker, 50-mL - 2
Graduated cylinder, 25-mL 
Graduated cylinder, 50- or 100-mL 
Transfer pipet - 3
Waste container 
Wash bottle filled with distilled (deionized) water
Buffer solution pH 4 - 25 mL
Buffer solution pH 10 - 25 mL
Distilled (deionized) water - 100 mL
Phenolphthalein indicator - 4 drops
0.1 M Hydrochloric acid - 5 mL
0.1 M Sodium hydroxide - 5 mL
0.5 M Acetic acid - 50 mL
0.5 M Sodium acetate - 10 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.