a 25 ml of sewage water sample was refluxed with 10ml of 0.25N K2Cr2O7 solution. The untreated potassium dichromate requires 6.5ml of 0.1 N FAS. 10 ml of potassium dichromate solution and 25 ml distilled water , under the same condition as sample required 27 ml of 0.1 n FAS. Calculate the COD of sewage.
Answers
Answer:
The COD of sewage is 656 ppm.
Explanation:
The area that any three-dimensional solid occupies is known as its volume. These solids can take the form of a cube, cuboid, cone, cylinder, or sphere.
Many forms have various volumes. We have examined the several solids and forms that are specified in three dimensions, such as cubes, cuboids, cylinders, cones, etc., in 3D geometry. We will discover how to find the volume for each of these forms.
Cubic units are used to quantify a solid's volume. For instance, the volume will be supplied in cubic metres if the dimensions are given in metres. The International System of Units uses this as the reference unit for volume (SI). Cubic metres, cubic feet, cubic inches, etc. are additional volume units.
COD = V2 –V1 X N X 8 X 1000/V
V2 = volume of FAS for blank titration
V1 = volume of FAS for sample titration
V = volume of sample taken for test
N = Normality of FAS
COD = 27 –6.5 X 0.1X 8 X 1000/25
COD = 656 ppm
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