Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074



Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Fluoridation of city water supplies has been practiced in the United States for several decades. It is done by continuously adding sodium fluoride to water as it comes from a reservoir. Assume you live in a medium-sized city of 150,000 people and that 660 L (170 gal) of water is used per person per day. What mass of sodium fluoride (in kilograms) must be added to the water supply each year (365 days) to have the required fluoride concentration of 1 ppm (part per million)—that is, 1 kilogram of fluoride per 1 million kilograms of water? (Sodium fluoride is 45.0% fluoride, and water has a density of 1.00 g/cm3.)

Interpretation Introduction

Interpretation: The mass of sodium fluoride to be identified.

Concept Introduction:

Density: A measurement of mass per unit volume.

Density = Mass volume


Volume of water used in a year by total people:_volume of water = 1,50,000 × 660 L ×365 days                            = 3.6135×1010kgofwater               = 3.6135×104millionkgofwaterwhereas,1Kgof

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