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Titration to end point

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Could you please explain what formula and step are involved and please provide (example) problem if possible:

A 40.0 mL sample of river water was titrated with 0.0010 M Na2Cr2O7 and required 8.3 mL to reach the end-point. What is the chemical oxygen demand, in milligrams of O2 per liter, of the sample?

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Titration of river water to find chemical oxygen demand.

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The basis for the COD test is that most organic compounds can be fully oxidized to carbon dioxide with a strong oxidizing agent. The dichromate reacts with the excess hydrogen in the water to produce chromium and ...

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