Vernier Software and Technology
Vernier Software & Technology

Oxidation-Reduction Titrations

Figure from experiment 19 from Investigating Chemistry through Inquiry


A titration, as you recall, is a convenient method of learning more about a solution by reacting it with a second solution of known molar concentration. There are a number of ways to measure the progress of a titration. In this experiment, you will use an ORP (Oxidation-Reduction Potential) Sensor to measure the electrical potential of the reaction being studied in a titration.

You will be titrating commercial bleach with hydrogen peroxide of known molarity in order to determine the molarity of the bleach sample. The reaction being studied can be represented as follows:

{\text{NaOCl(aq)  +  }}{{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}}{\text{(aq)}} \to {\text{NaCl(aq)  +  }}{{\text{H}}_{\text{2}}}{\text{O(l)  +  }}{{\text{O}}_{\text{2}}}{\text{(g)}}

where NaOCl is sodium hypochlorite, a representative component of bleach, and H2O2 is the formula for hydrogen peroxide. The products are sodium chloride, water, and oxygen. Your sample of H2O2 will come from a bottle of ordinary, over-the-counter hydrogen peroxide purchased at a grocery or a drug store. The concentration of this product is labeled as 3% mass/volume, which is ~0.88 M.


In the Preliminary Activity, you will be titrating commercial bleach with hydrogen peroxide of known molarity in order to determine the molarity of the bleach sample.

After completing the Preliminary Activity, you will first use reference sources to find out more about oxidation, reduction, and oxidation-reduction titrations before you choose and investigate a researchable question using oxidation-reduction titrations.

Sensors and Equipment

This investigation features the following Vernier sensors and equipment.

Option 1

Option 2

Additional Requirements

You may also need an interface and software for data collection. What do I need for data collection?

Standards Correlations

See all standards correlations for Investigating Chemistry through Inquiry »

Investigating Chemistry through Inquiry

See other experiments from the lab book.

1Physical Properties of Water
2Baking Soda and Vinegar Investigations
3An Investigation of Urea-Containing Cold Packs
4Conductivity of Aqueous Solutions
5Identifying a Pure Substance
6Investigating the Energy Content of Foods
7Investigating the Energy Content of Fuels
8Evaporation and Intermolecular Attractions
9Enthalpy Changes
10Reaction Stoichiometry
11Beer's Law Investigations
12Colligative Properties of Solutions
13Long Term Water Monitoring
14Vapor Pressure and Heat of Vaporization Investigations
15Acid-Base Properties of Household Products
16The Effect of Acid Deposition on Aqueous Systems
17Acid-Base Titrations
18Conductimetric Titrations
19Oxidation-Reduction Titrations
20Investigating Voltaic Cells
21Baking Soda and Vinegar Investigations Revisited
22Reaction Rates
23Enzyme Activity
24Sugar Fermentation by Yeast
25Nuclear Radiation

Investigation 19 from Investigating Chemistry through Inquiry Lab Book

<i>Investigating Chemistry through Inquiry</i> book cover

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