3 parts per million (ppm) of sodium ions in a solution is equivalent to:

Question

BlackTom AI · Accepted Answer

Begin by restating the question: what is 3 parts per million (ppm) of sodium ions in a solution equivalent to in terms of a common concentration unit?
Option 1: 3 mg/L. In dilute aqueous solutions, 1 ppm is approximately equal to 1 mg of solute per liter of solution (mg/L). Therefore, 3 ppm corresponds closely to 3 mg/L, making this option consistent with the standard conversion used in chemistry and environmental science for dilute aqueous systems.
Option 2: 0.3 mg/L. This would represent 0.3 ppm, not 3 ppm. The decimal place is shifted by a factor of 10, so this underestimates the concentration by tenfold. This is incorrect for 3 ppm.
Option 3: 3,000,000 mg/L. This implies 3,000,000 mg per liter, which is 3,000 g/L or 3 kg/L—an enormous, physically implausible concentration for a solution. It vastly overstates the amount and is not a reasonable interpretation of 3 ppm.
Option 4: 30 mg/L. This would correspond to 30 ppm, which is ten times larger than the given 3 ppm. Again, this does not match the defined 3 ppm value and is therefore incorrect.
In summary, using the conventional ppm ~ mg/L approximation for aqueous solutions leads directly from 3 ppm to 3 mg/L, while the other choices reflect misplacement by factors of 10 or orders of magnitude, or misinterpretation of the unit conversion.

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