Post a New Question

chemistry

posted by .

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?

  • chemistry -

    173 x 7.9 million x 365 = x
    x/1 million = gallons of flourine

  • chemistry -

    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.

  • chemistry -

    Ooops. I goofed. Thanks for the correction, Dr. Bob.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. 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.
  2. Physics for life scince

    III) The municipality of New York supplies 2 million cubic metres of water per month to the city of New York. If a household consumes about 30killo-littres of water per month, estimate the number of residents in New York ,assuming …
  3. 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 …
  4. Engineering Economics

    Sales of bottled water in the U.S totaled 16.3 gallons per person in 2004. Water costs .40 cents per bottle.A municipal company provides tap water for $2.10 per 1000 gallons. If the average person drinks two bottles of water per day …
  5. math

    The amount of pollution, A (in part per million), present in the air outside a factory on a recent weekday is represented by the equation A= -t^2+16t+6, where t is the number of hours after 7 AM. (a) find the Times (in radical form) …
  6. Science 7

    Problem; How small is 1 part per million?
  7. 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 …
  8. College Algebra

    The per-capital 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?
  9. 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 …
  10. Math

    Topic: Water Footprint. City of New York 2011 rate of 7.64/100 cubic feet of water. Calculate the cost of each of the following based on this rate. Use the conversion factor of 7.48 gallons per cubic food. A. A standard washing machine …

More Similar Questions

Post a New Question