Quantities and Reactions : Stoichiometry

Stoichiometry

Explore the "chemical math" behind stoichiometry by calculating the optimal mole ratios required to maximize yield during a chemical reaction. Learn more

Conductometric Titration

Determine the concentration of an unknown base solution by measuring the changes in conductivity during an acid-base titration. Learn more

Stoichiometry

Determine the stoichiometry of a chemical reaction by finding the ideal ratio of reactants needed to produce the greatest amount of heat energy.

Stoichiometry

In the trials of this reaction, the maximum temperature occurs when the reactants have the optimal ratio of moles of substance. Enlarge graph

Lab Summary:

In this exploration, students will use a temperature sensor to investigate an exothermic chemical reaction by combining a set of reactants in various proportions and measuring the resulting temperature change in each case. By determining the optimum ratio of reactants needed to produce the greatest amount of heat, students will determine the stoichiometry of the reaction.

Download Free Lab  (PDF, 536 KB)

(student version)

Method:

Use the Temperature Sensor to investigate an exothermic chemical reaction by combining a set of reactants in various proportions and measuring the resulting temperature change in each case. Determine the optimum ratio of reactants needed to produce the greatest amount of heat and determine the stoichiometry of the reaction.

Here's What You Need:

Probeware

Other Materials

  • Foam cups or small beakers
  • Graduated cylinder, 10-mL
  • Wash bottle and waste container
  • 0.5 M sodium hypochlorite, NaClO
  • 0.5 M sodium thiosulfate, Na2S2O3
  • 0.2 M sodium hydroxide, NaOH

Lab Manual:

This activity is included in Explorations in Chemistry (PS-2808), complete with Teacher Information pages, student instructions and handouts, and sample data for a total of 25 probeware-based labs. For your convenience, we offer bundles which provide the probeware necessary for the activities in the manual. For more information on these resources and bundles, click here.

Conductometric Titration

Predict the mass of copper consumed in a single replacement reaction.

Conductometric Titration

The lowest conductivity occurs at the equivalence point of the barium hydroxide and the sulfuric acid. Enlarge graph

Lab Summary:

In this lab, you will use a PASPORT Conductivity Sensor and Drop Counter to titrate a barium hydroxide solution of unknown concentration with a sulfuric acid solution of known concentration. You will use your data and the stoichiometry of the reaction to determine the concentration of the barium hydroxide solution.

Download Free Lab  (PDF, 332 KB)

(student version)

Method:

Use a conductivity sensor and drop counter to titrate a Barium hydroxide solution of unknown concentration with a Sulfuric acid solution of known concentration. You will use your data and the stoichiometry of the reaction to determine the concentration of the Barium hydroxide solution.

Here's What You Need:

Probeware

Other Materials

Lab Manual:

The computer-based activity is included in Chemistry with the Xplorer GLX (PS-2819A). The Xplorer GLX-based lab is included in Chemistry with the Xplorer GLX Bundle (PS-2624). Both manuals are complete with Teacher Information pages, student instructions and handouts, and sample data.

For your convenience, we offer bundles which provide the probeware for the activities in the manual. For more, please see:

Computer-based Physics Lab Manual and Bundles

Xplorer GLX-based Physics Lab Manual and Bundles