Fluoride is known to prevent tooth decay so it is added to the city water supply for drinking. a medium sized city is populated with 150,000 people. each person appeoximately 660.0 l of water each day. how many kg of naf must be added to the water supply each year to have the required fluoride concentration of 1.0 ppm? how to get the answer of 8.0×10^4 kgnaf/year?

Given the population of city = 150,000 people

Volume of water consumed by each person = 660.0 L

Total volume consumed in the city every year = *=/year

The required fluoride concentration is 1.0 ppm

1.0 ppm means 1.0 mg fluoride per liter of water

Calculating the mass of NaF that must be added in kg:

                        =

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explanation:

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.