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Parts Per Million Concentration (ppm) Chemistry Tutorial

... mL = 1 mL ÷ 1000 mL L -1 = 0.001 L. Step 4: Calculate concentration: divide mass (mg) by volume (L). ppm = mass (mg) ÷ volume (L). ppm = 0.5 mg ÷ 0.001 mL = 500 ...

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