5.3. Regulatory Considerations for Mass Balance

Try these first

1. 1.

   Define mass balance in the context of environmental chemistry.

   Hint

   Remember, mass cannot be created or destroyed.

2. 2.

   What is a partitioning constant?

   Hint

   Think of it like a ratio!

3. 3.

   What does mass balance imply in environmental engineering?

   • A. Mass can be created
   • B. Mass must remain constant
   • C. Mass can be destroyed

   Hint

   Reflect on conservation principles in physics.

4. 4.

   True or False: If a chemical exceeds its solubility limit, it cannot exist in water.

   • True
   • False

   Hint

   Think about how solids interact with liquids.

5. 5.

   Calculate the mass balance of a scenario where 200 kg of a contaminant is introduced in a body of water. Given the solubility of the contaminant is 50 mg/L and its partitioning constant with air is 0.5. How much will remain undissolved if the mass of water in the system is 1000 L?

   Hint

   Calculate the maximum based on given volume and solubility first.

6. 6.

   In a simulated spill, a chemical spills and partitions between air and water. If the partitioning constant is 10 (favoring water), and the initial concentration in water is estimated to be 300 mg/L, what might you predict about the air phase concentration?

   Hint

   Refer to the definition of partitioning for the estimate.