Question: how to convert mg/l to percentage?
Answer: The easier thing is to convert to a mass/volume percentage. A 1% m/v solution has 1 gram of solute per 100 mL of solution, or 10 grams per liter. Using our example of 100 mg/L again, There are ten 100-mL units in a liter, so 100 mg/L = 10 mg/100 mL = 0.01 g/100 mL = 0.01% m/v.