Express each of these concentrations in parts per million

Question

A.) 6.5 milligrams per kilogram of water

B.) 6.5 Micrograms per kilogram of water

C.) 6.5 nanograms per kilograms of water

Answer 1

ppm= ((mass of solute, mg)/(mass of solution, mg)) * 10⁶

1 Kg= 10⁶mg

1ug= 10^-3mg

1ng= 10^-6mg

A) ppm= (6.5mg/10⁶mg)*10⁶mg= 6.5 ppm

B) ppm= (6.5*10^-3mg/10⁶mg)*10⁶mg= 6.5*10^-3 ppm

C) ppm= (6.5*10^-6mg/10⁶mg)*10⁶mg= 6.5*10^-6 ppm

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