What is the role of sodium azide in do experiment

Asked by admin @ 02/08/2021 in Chemistry viewed by 228 People

What is the role of Sodium azide in DO experiment ?

Answered by admin @ 02/08/2021

DO or dissolved oxygen can be tested by the azide modification of the Winkler Method. In it a buret is used and 0.025 N sodium thiosulfate is filled in it . In the analysis, manganous ion reacts with the dissolved oxygen present in the alkaline solution to form a manganese (IV) oxide hydroxide. Azide is added to suppress the interference from nitrite present that would react with the iodide. The solution is then acidified and the manganese (IV) floc is reduced by iodide to produce free iodine as I₃⁻ in proportion to the oxygen concentration. The liberated iodine is then titrated to the starch-iodide end point.

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What is the role of sodium azide in do experiment

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