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How would I prepare five perchlorate standard solutions with concentrations in the range 20 to 100 g/L (ppb) from a 1 mg/L (ppm) perchlorate stock

How would I prepare five perchlorate standard solutions with concentrations in the range 20 to 100 g/L (ppb) from a 1 mg/L (ppm) perchlorate stock solution and then prepare at least 10 mL of each standard using deionized water. calculations needed

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