Mathematics · Environmental Chemistry Calculations
During a Chemical Oxygen Demand (COD) analysis, a 25 mL wastewater sample required 40 mL of 0.1 N K2Cr2O7 (potassium dichromate) solution for complete oxidation. Calculate the COD of the wastewater sample in mg/L.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 11120 mg/L
- 21360 mg/L
- 3960 mg/L
- 41280 mg/L✓
Correct answer
1280 mg/L
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