# math

How many gram ofsodiun fluoride should be added to 100000liter of drinking water containing 0.6 ppm of sodium fluoride to provide a recommended concentration of 1.75 ppm

1. 👍 0
2. 👎 0
3. 👁 927
1. look at the amounts of NaF involved:
(.6/10^6)*100000 + 1.0*x = (1.75/10^6)(100000+x)
x = 0.115

check:
.6 ppm in 10^5L = 0.06g
add 0.115 g and you have 0.175g, or 1.75ppm

1. 👍 0
2. 👎 0
posted by Steve
2. Thank you .. but the right answer in my book is 115g

1. 👍 0
2. 👎 0
posted by sara
3. Hmm. Obviously I misplaced a decimal point. I expect you can find the flaw in my reasoning.

1. 👍 0
2. 👎 0
posted by Steve
4. 1.75-0.6ppm=1.15ppm
Which means 1.15g in 10^6mls
So how many grams in 10litres.
Change litres into mls and calculate

1. 👍 1
2. 👎 0

## Similar Questions

1. ### math

How many gram of sodium fluoride should be added to 100000 liter of drinking water containing 0.6 ppm of sodium fluoride to provide a recommended concentration of 1.75 ppm? Answer is 115 grams. I keep getting .115 g What am I

asked by Jessica on May 12, 2016
2. ### 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

asked by Anonymous on October 1, 2015
3. ### Chemistry

The Label on a one pint bottle of water lists the following components. If the density is the same as pure water and you drink 3 bottles of water in one day, how many milligrams of each component will you obtain? 1) calcium 29 ppm

asked by Susan on September 7, 2008
4. ### Chemistry

The Label on a one pint bottle of water lists the following components. If the density is the same as pure water and you drink 3 bottles of water in one day, how many milligrams of each component will you obtain? 1) calcium 29 ppm

asked by Susan on September 7, 2008
5. ### chem

The label on a 1-pint bottle of mineral water lists the following components. If the density is the same as pure water and you drink 5 bottles of water in one day, how many milligrams of each component will you obtain? fluoride

asked by Anonymous on September 3, 2011
1. ### chem

The label on a one-pint bottle of water lists the following components. If the density is the same as pure water and you drink 2 bottles of water in one day, how many milligrams of each component will you obtain? calcium 28 ppm,

asked by sandra on June 10, 2010
2. ### Chemistry -Dr.Bob

Toxic chemicals in drinking water usually are reported and a safety level specified in units of parts per million (ppm) by mass. What is the molar concentration of arsenic in a water sample that has 1ppm arsenic (As)? DrBob222 1

asked by Tiffany on October 25, 2015
3. ### Chemistry

A 200. gram sample of a salt solution contains 0.050 grams of NaCl. What is he concentration of the solution in parts per million? a)50. ppm b)250. ppm c)2.5 * 10^-4 ppm d)5.0 * 10^4 ppm

asked by Tamara on February 12, 2012
4. ### Chemistry

A water treatment plant adds fluoride ion to the water to the extent of 1.5mg F-/L H2O. a)What is the molarity of fluoride ion in this water? b)If the fluoride ion in the water is supplied by calcium fluoride, what mass of calcium

asked by Faith on October 13, 2015
5. ### Environmental Science

#33. In two or three well-developed paragraphs, explain how water is treated so that it can be used for safe drinking water. Include definitions of the terms potable and pathogens. my answer: There are many steps to how water is

asked by y912f on February 23, 2010

More Similar Questions