The COD (Chemical Oxygen Demand) of a water s | vedclass

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Question

(A) The $COD$ (Chemical Oxygen Demand) is a measure of the amount of oxygen required to chemically oxidize organic matter in a water sample. It is det

Vedclass · Accepted Answer

$50 \% H_2SO_4, K_2Cr_2O_7$

Vedclass · Answer

(A) The $COD$ (Chemical Oxygen Demand) is a measure of the amount of oxygen required to chemically oxidize organic matter in a water sample. It is determined by refluxing the water sample with a known excess of potassium dichromate $(K_2Cr_2O_7)$ in the presence of concentrated sulfuric acid $(H_2SO_4)$. The excess $K_2Cr_2O_7$ is then back-titrated with ferrous ammonium sulfate. Therefore,the correct reagents used are $50 \% H_2SO_4$ and $K_2Cr_2O_7$.

The $COD$ (Chemical Oxygen Demand) of a water sample is determined using:

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