Quantities and Reactions : Decomposition

Determine the percent of H₂O₂ in store-bought hydrogen peroxide solution.

Lab Summary:

In this exploration, students will use a temperature sensor and an absolute pressure sensor to measure the amount of oxygen produced in a decomposition reaction. They will then use this information to calculate the percent concentration of store-bought hydrogen peroxide.

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(student version)

Method:

Use a Temperature Sensor to determine the characteristics of synthesis (combination) reactions.

Here's What You Need:

Probeware

• PASPORT Absolute Pressure Sensor (PS-2107)
• PASPORT Temperature Sensor (PS-2125)
• Xplorer GLX Graphing Datalogger (PS-2002)
  (or alternate PASPORT interface -- see other options)

Other Materials

• Balance (SE-8756A)
• Rubber stopper, two-hole
• Erlenmeyer flask, 125-mL
• Graduated cylinder, 100-mL
• Manganese dioxide, MnO₂
• 3% hydrogen peroxide, H₂O₂
• Glycerin, C₃H₅(OH)₃

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.