100 ml of a sample of water requires 1.96 mg of potassium dichromate in the presence of `50% H_(2)SO_(4)` for the oxidation of dissolved oxygen demand.

100 ml of a sample of water requires 1.96 mg of potassium dichromate i

1.	100 ml of a sample of water requires 1.96 mg of potassium dichromate in the presence of `50% H_(2)SO_(4)` for the oxidation of dissolved oxygen demand.
Answer» One gram equivalent of any oxidant can give, one equivalent weight of oxygen (8 g) `49 g K_(2) Cr_(2)O_(7) rarr 8g O_(2)` `1.96 K_(2) Cr_(2)O_(7) rarr ?` `=(8xx1.96)/(49)=0.32 mg` Chemical oxygen demand of the given 100 ml sample of water `=0.32/0.1=3.2` ppm

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100 ml of a sample of water requires 1.96 mg of potassium dichromate in the presence of `50% H_(2)SO_(4)` for the oxidation of dissolved oxygen demand.

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