Advertisement Remove all ads

6ml of Waste Water Was Refluxed with 25ml Ofk2cr20 7 Solution and After Refluxing the Excess Unreacted Dichromate Required 20ml of 0. 1 N Fas Solution. a Blank of Distilled Water on Refluxing with 25 - Applied Chemistry 1

Answer in Brief

6ml of waste water was refluxed with 25ml ofK2Cr2 O7 solution and after refluxing the excess unreacted dichromate required 20ml of 0. 1 N FAS solution. A blank of distilled water on refluxing with 25 ml of K2Cr2O7 solution required 35ml of 0. 1 N FAS solution . Calculate the COD of the waste water sample.

Advertisement Remove all ads


Given data:-            Vb=35mI,                Vt=20ml,

                                N=O. 1N,                  Y=6ml.

To find:-                  COD{Chemical Oxygen Demand).

Formula:-               `COD = ((Vb - Vt) xx N xx 8000)/(Y)` mg/L

Solution:-               `COD = ((35-20) xx 0.1 xx 8000)/6` mg/L

                               COD = 2000mg/L

Concept: COD- Definition and Significance
  Is there an error in this question or solution?
Advertisement Remove all ads
Advertisement Remove all ads
Advertisement Remove all ads

View all notifications

      Forgot password?
View in app×