Question

A teacher wants to prepare a 0.010 ppm solution of Animenic 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 Animenic pentoxide should the teacher mix to get the required solution?
Use mc016-1.jpg.
2.0 mc016-2.jpg 10-11 g
2.0 mc016-3.jpg 10-5 g
5.0 mc016-4.jpg 10-6 g
5.0 mc016-5.jpg 10-2 g

Answer 1

0.010 ppm = 0.010mg/L

so convert the volume of water to L first and calculate the mass, in mg, of the animenic pentoxide. the answers are in grams so you will then divide your mass of animenic pentoxide to g by dividing by 1000