a city's water supply is fluoridated by adding NaF.The desired concentration of F- is 1.6 ppm. How many mg of NaF should be added per g
allon of treated water if the water supply already is 0.2 ppm in F-?
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Some solutions are so dilute that the usual concentration units of mol/L are not small enough to avoid providing cumbersome values. Parts per million, ppm, is used in these instances which is a mass fraction multiplied by one million. Parts per billion, is used when even ppm is not small enough.
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Parts per million can be expressed as a weight fraction in
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