A blank of distilled water on refluxing with 30ml of dichromate solution required 36ml of 0.1M FAS solution. Calculate the COD value of the waste water.

FE > Semester 1 > Applied Chemistry 1

Marks : 03

Years : DEC 2015

Given:

$V_b=36 ml \\ V_t=23 ml \\ V_e=30 ml \\ N = 0.1 \\ COD=\dfrac {(V_b-V_t×N×8)×1000}{V_e }\\ =\dfrac {(36-23×0.1×8)×1000}{V_e } \\ =\dfrac {13×8×100}{30} \\ =\dfrac {10400}{30} \\ =346.67$