Question

6.67 x 10-3 g of arsenic (As) is found in a 0.600 L sample of water. If the density of this

sample is 1.00 g/mL, what is the concentration of arsenic in ppm?

Answer 1

ppm = mg/L = mg/kg

6.67 x 10⁻³ g = 6.67 mg

ppm = 6.67 mg : 0.6 L = 11.12