31 option 3 From 100.00 ml of waste water, the herbicid

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31 option 3
From 100.00 ml of waste water, the herbicide, the cotoran, was extracted with chloroform. The extract was evaporated, transferred to a cuvette and titrated at 290 nm with acetic acid HClO4 T (HClO4 / koran) = 0.0003000 g / ml. Calculate the concentration of mg / l in water according to the following results:
Option 3
Optical density of the solution after adding HClO4
0.0 ml 0.4 ml 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0
0.375 0.335 0.300 0.265 0.225 0.190 0.155 0.125 0.100 0.085 0.070