A town located downstream from a chemical plant was concerned about fluoride ions from the
plant leaking into its drinking water. According to
the Environmental Protection Agency, the fluoride
ion concentration in drinking water cannot exceed
4 ppm. The town hired a chemist to analyze its
water. The chemist determined that a 175-gram
sample of the town's water contains 0.000250
gram of fluoride ions.
How many parts per million of fluoride ions are
present in the analyzed sample?

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Sink to the bottom. addition of potassium nitrate past it’s dissolution capacity at a particular temperature will cause the extra to just sink to the bottom of the glass.however, if you were to raise the temperature of the solution prior to dissolving it, and then slowly decrease the temperature after the dissolution, you would create a “supersaturated” solution - a solution that has more solute dissolved into it than should be allowed. if you add any extra solute past this, the entire solution would “crystallize,” and this is how you get those cool videos on youtube.

Needs for population