You take a 30 ml sample of pond water and test it with yoursampling kit. You fin

Question

You take a 30 ml sample of pond water and test it with yoursampling kit. You find that the water contains 20 ppm ofphosphates. You weight the sample and find that its mass is31 g. What is the mass of the phosphate in your sample? Report your result in milligrams Just the equation please, not the answer. You take a 30 ml sample of pond water and test it with yoursampling kit. You find that the water contains 20 ppm ofphosphates. You weight the sample and find that its mass is31 g. What is the mass of the phosphate in your sample? Report your result in milligrams Just the equation please, not the answer. Just the equation please, not the answer.

Explanation / Answer

We have to assume that 31g is actually 31.0000 g (otherwise20ppm represents an insignificant mass)

20 ppm = 20 / 1000000

so 20 ppm of 31g is   31 x 20/1000000g (=0.62 mg)

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