If the active ingredient is 0.8 ppm in a 42.1 acre-foot pond, how much active ingredient is needed?

If the active ingredient is 0.8 ppm in a 42.1 acre-foot pond, how much active ingredient is needed?

• A. 90.9 lbs
• B. 70 lbs
• C. 100 lbs
• D. 50 lbs

Answer: (A)

To determine the amount of active ingredient needed in a pond, you need to first convert the active ingredient concentration from parts per million (ppm) to a weight measurement that can be applied to the volume of water in the pond. 1. **Understand the Measurement**: One ppm means one part of the substance in one million parts of solution. In terms of water, 1 ppm is equivalent to 1 milligram of active ingredient in 1 liter of water. 2. **Convert Acre-Feet to Gallons**: One acre-foot is the volume of water that would cover one acre of land to a depth of one foot. This is equivalent to 43,560 cubic feet, or approximately 325,851 gallons. 3. **Calculate the Total Volume of the Pond**: In this case, a 42.1 acre-foot pond contains: \[ 42.1 \, \text{acre-feet} \times 325,851 \, \text{gallons/acre-foot} \approx 13,743,243 \, \text{gallons} \] 4. **Convert Gallons to Liters**: Knowing that there are about 3.785 liters in a

To determine the amount of active ingredient needed in a pond, you need to first convert the active ingredient concentration from parts per million (ppm) to a weight measurement that can be applied to the volume of water in the pond.

1. Understand the Measurement: One ppm means one part of the substance in one million parts of solution. In terms of water, 1 ppm is equivalent to 1 milligram of active ingredient in 1 liter of water.

2. Convert Acre-Feet to Gallons: One acre-foot is the volume of water that would cover one acre of land to a depth of one foot. This is equivalent to 43,560 cubic feet, or approximately 325,851 gallons.

3. Calculate the Total Volume of the Pond: In this case, a 42.1 acre-foot pond contains:

[

42.1 , \text{acre-feet} \times 325,851 , \text{gallons/acre-foot} \approx 13,743,243 , \text{gallons}

]

4. Convert Gallons to Liters: Knowing that there are about 3.785 liters in a