Certified Crop Advisor Practice Exam

Ten (10) ppm is equivalent to what concentration?

1. 1000 ppb

2. 10 mg/l

3. 10 ug/l

4. 100 ppb

The correct answer is: 10 mg/l

Ten parts per million (ppm) is a concentration measurement that indicates how many parts of a substance are present per million parts of solution. To understand why ten ppm is equivalent to ten mg/l, it’s important to know that in aqueous solutions, one ppm typically corresponds to one mg of solute per liter of solution. Thus, when you have 10 ppm of a substance in water, it means that there are 10 mg of that substance in one liter of water. This relationship holds true under the assumption of standard temperature and pressure, where the density of water is approximately 1 g/mL. The other options represent different concentration units or conversions which do not match the definition of 10 ppm in this context.