Answer Posted / cristopher c. buban
The unit parts per million (ppm) is numerically equivalent to mg/L. So 1000 ppm of methylene blue solution is equal to 1000 mg/L. Weigh 1000 mg or 1 g of methylene blue and dissolve it, let me say with 100 mL of distilled water and adjust the final volume of the solution to 1L.
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