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A 10ml of Sample of Waste Water Was Refluxed with 20ml of Potassium Dichromate Solution and After Refluxing the Excess Unreacted Dichromate Required 36.2ml of 0. - Applied Chemistry 1

Answer in Brief

A 10ml of sample of waste water was refluxed with 20ml of potassium dichromate solution and after refluxing the excess unreacted dichromate required 36.2ml of 0. 1M FAS solution. A blank of 1Om/ of distilled water on refluxing with 20ml of dichromate solution required 46ml of 0. 1M FAS solution. Calculate the COD value of waste water.

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Solution

Given data :-          Vb = 46ml           Vt = 36.2ml

                              N = 0.1M              Ve = 10ml

     To find:-                COD

Solution :-          `COD = ((Vb-Vt) xx "Normality"  xx 8000)/Ve`

                            `=(( 46-36.2) xx 0.1  xx 8000)/10`

                            = 784ppm
Hence the COD value is 784 ppm.

Concept: COD- Definition and Significance
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