Chemical Oxygen Demand (COD) Quiz
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Questions and Answers

Which unit is commonly used to express the chemical oxygen demand (COD)?

  • Pounds per gallon (lb/gal)
  • Kilograms per liter (kg/L)
  • Milligrams per liter (mg/L) (correct)
  • Grams per liter (g/L)
  • What can a COD test be used to quantify in water?

  • The amount of organic compounds in water (correct)
  • The amount of inorganic compounds in water
  • The amount of pollutants in water
  • The amount of oxygen in water
  • What is the most common application of COD?

  • Quantifying the amount of pollutants in surface water (correct)
  • Quantifying the amount of inorganic compounds in surface water
  • Quantifying the amount of oxygen in surface water
  • Quantifying the amount of organic compounds in surface water
  • What is the basis for the COD test?

    <p>The ability of organic compounds to be fully oxidized to carbon dioxide</p> Signup and view all the answers

    What is the equation that represents the amount of oxygen required to oxidize an organic compound to carbon dioxide, ammonia, and water?

    <p>C_nH_aO_bN_c + O_2</p> Signup and view all the answers

    Study Notes

    Chemical Oxygen Demand (COD)

    • The unit commonly used to express COD is milligrams per liter (mg/L).

    Applications of COD Test

    • A COD test can be used to quantify the amount of organic compounds present in water that are oxidizable.

    Most Common Application

    • The most common application of COD is in wastewater treatment to measure the effectiveness of treatment processes.

    Basis of COD Test

    • The COD test is based on the amount of oxygen required to oxidize an organic compound to carbon dioxide, ammonia, and water.

    COD Equation

    • The equation that represents the amount of oxygen required to oxidize an organic compound is: COD (mg/L) = 2CrO₄²⁻ + 3H₉ CrO₄ + 2H+ → Cr³⁺ + 4H₂O + 3CO₂.

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    Description

    Test your knowledge on Chemical Oxygen Demand (COD) and its application in environmental chemistry. This quiz will cover topics such as measuring COD, its units of measurement, and how it is used to quantify organic content in water. Put your knowledge to the test and see how well you understand this important concept in environmental science.

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