chemistry
posted by greg
New York citys 7.9 million people have a daily per capita consumption of 173 gallons of water. how many tons of sodium flouride would be requred per year to give this watr 1 part flourine per million parts water?

Ms. Sue
173 x 7.9 million x 365 = x
x/1 million = gallons of flourine 
DrBob222
Close but not quite there.
I assume 1 part flourine per million parts really means 1 part flouride ION per million parts.
First, convert 1 part flouride ion to sodium flouride since the problem specifies using NaF.
1 part F x (molar mass NaF/molar mass F) = 1 x 41/19 = = ??. I have something like 2.2 or so and that will be tons if we keep all the other units in tons.
Next, convert 7.9 million people using 173 gallons water/day to gallons of water used per day.
173 gal/person x 7.3*10^106 people = gallons used per day.
Convert gallons of water used per day to cubic feet of water used per day using the density of water which is 62.4 lbs/cubic foot.
Convert lbs water used per day to tons per day using 2000 lbs = 1 ton
Now you have tons of water used per day and you want 2.2 tons sodium flouride in each 1,000,000 tons of water to make the 1 ppm F.
Multiply that answer by 365 to obtain tons NaF (sodium flouride) used in a year.
Check my thinking. Check my work. 
Ms. Sue
Ooops. I goofed. Thanks for the correction, Dr. Bob.
Respond to this Question
Similar Questions

chemistry
Calculating Parts per million Helium gas, 3.0 x 10^4 is dissolved in 200.0 g of water. Express this concentrartion in parts per million. 
Math(Probability)
Students took n = 35 samples of water from the east basin of Lake Macatawa and measured the amount of sodium in parts per million. For their data, they calculated notation bar x= 24.11 and s^2= 24.44. Find an approximate 90% confidence … 
Statistics
The daily water consumption for an Ohio community is normally distributed with a mean consumption of 750,000 gallons and a standard deviation of 80,000 gallons. The community water system will experience a noticeable drop in water … 
stats
The per capita consumption of coffee by people in the United States in a recent year was normally distributed, with a mean of 24.2 gallons and a standard deviation of 8.1 gallons. What proportion of people in the U.S. drink more than … 
Math
The table shows the number of people in millions who participate in 5 sports in a recent year. About how many more people swam than played soccer? 
Chemistry
you are a public health officer in the water treatment facility for a city of 50,000 people . A concentration of 1.0 ppm of fluoride in the drinking water is sufficient for the purpose of helping to prevent tooth decay. The compund … 
Chemistry
I have 25 million gallons of water at a pH of 6.5. I add 17.4 million gallons of 12.5% by wt sodium hypochlorite (NaClO) at a pH of 12.5 to this water. What will my pH of my final solution be? 
College Algebra
The percapital consumption of bottled water wa 5 gallons in 1990 and has been increasingly yearly by a factor of 1.083. What was the per capital consumption of bottled water 13 years later? 
Algebra
The yearly per capita consumption of whole milk in the United States reached a peak of 40 gallons in 1945, at the end of World War II. By 1970 consumption was only 27.4 gallons per person. It has been steadily decreasing since 1970 … 
Java programming
How can I do the math specifically on this The water rates vary depending on the type of usage. A code of H means home use, a code of C means commercial use, and a code of I means industrial use. Any other code value should be treated …