A sample of a new cleaning product, "Joe's Famous Bleach Cleaner," with a mass of 48.0 g , was...


A sample of a new cleaning product, "Joe's Famous Bleach Cleaner," with a mass of 48.0 g , was diluted with an acetic acid solution containing excess I?. A small amount of starch indicator solution was then added, turning the solution a deep bluish-purple. The solution was then titrated with 0.110 M sodium thiosulfate, Na2S2O3, containing the ion S2O32?. A volume of 43.0 mL of sodium thiosulfate, the titrant, was needed to turn the solution colorless.

Part A

What is the percentage composition by mass of NaClO in the bleach product?

Redox Titrations:

Titrations can be performed by utilizing redox reactions since redox reactions go to completion and can be easily monitored. A redox reaction involves a transfer of electrons in which one atom loses electron and is oxidized while another atom gains electrons and is reduced. A redox titration can be carried out using a reducing agent or oxidizing agent as the standard solution, however, reducing agents tends to be oxidized by air. For this reason titrations involving standard reducing agents are not typically used to analyze an oxidation agent. One notable exception to this is thiosulfate. This reducing agent is stable enough to not be oxidized by air and can be used in redox titrations if the solution is slightly acidic. Iodine and starch are used in titrations involving thiosulfate.

Answer and Explanation: 1

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The iodide reacted with sodium hypochlorite in the following reaction equation

{eq}OCl^-(aq) + 2I^-(aq) + 2H^+(aq) \rightarrow Cl^-(aq) + I_2(aq) +...

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Redox Titration Lab
Redox Titration Lab


Chapter 3 / Lesson 18

Identify the concentration of a common household chemical, hydrogen peroxide. Using a known concentration of potassium permanganate, you'll be able to perform a titration experiment to discover the unknown concentration of hydrogen peroxide.

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