It is recommended that drinking water contain 1.6 ppm fluoride (f−) for prevention of tooth decay. consider a reservoir with a diameter of 4.70 ✕ 102 m and a depth of 14.2 m. (the volume is πr2h, where r is the radius and h is the height.) how many grams of f− should be added to give 1.6 ppm?

total amount of fluoride 3.6 *10^6 g

Explanation:

we know that

volume of reservoir

                                  =

                                  = 2.25*10^6 m^3

denso=ity of water = 1000 kg/m3

mass of water = 1000*2.25*10^6

                         = 2.25*10^9 kg = 2.25*10^12 g

fluoride 1.6 ppm

total amount of fluoride

                                         = 3.6 *10^6 g

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