If a solution is 78,000 ppm, what is its concentration in milligrams per liter?

To convert parts per million (ppm) into milligrams per liter (mg/L), it is essential to recognize that 1 ppm is equivalent to 1 mg/L when dealing with water or aqueous solutions. This is because 1 ppm represents 1 milligram of solute in 1 liter of solution.

Given a concentration of 78,000 ppm, you can directly interpret this value in terms of mg/L. Since 78,000 ppm is equivalent to 78,000 mg/L, this measurement reflects the mass of the substance in milligrams per liter of solution.

Therefore, when you see a concentration of 78,000 ppm, it translates precisely to 78,000 mg/L, confirming that this answer is correct based on the fundamental relationship between concentration units in aqueous solutions.