A teacher wants to prepare a 0.010 ppm solution of arsenic pentoxide in the laboratory for calibrating a water quality testing system. If the teacher uses 500.0 mL of water (which has a mass of 500.0 g), what mass of arsenic pentoxide should the teacher mix to get the required solution?

A. 2.0 x 10^-11 g
B. 2.0 x 10^-5 g
C. 5.0 x 10^-6 g
D. 5.0 x10^-2 g

Question

A teacher wants to prepare a 0.010 ppm solution of arsenic pentoxide in the laboratory for calibrating a water quality testing system. If the teacher uses 500.0 mL of water (which has a mass of 500.0 g), what mass of arsenic pentoxide should the teacher mix to get the required solution?

A. 2.0 x 10^-11 g
B. 2.0 x 10^-5 g
C. 5.0 x 10^-6 g
D. 5.0 x10^-2 g

aaronq · Answer

1 ppm = 1 mg/L

scale accordingly