1 ppm = 1 mg/L
For Zn, toxic level is 6.42E-2 mM.
That is 6.42E-5 M = 6.42E-5 mols/L. So in 1 L solution we have 6.42E-5 mols and grams Zn = mols Zn x atomic mass Zn and that gives you grams Zn/L. Convert to mg Zn/L and that is that many ppm.
grams Zn = m
Zinc, copper, lead, and mercury ions are toxic to Atlantic salmon at concentrations of 6.42 × 10–2 mM, 7.16 × 10–3 mM, 0.965 mM, and 5.00 × 10–2 mM, respectively. What are the corresponding concentrations in milligrams per liter? Concentration of zinc, copper, lead, and mercury? _____ Mg/mL.
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