Posted by Susan on .
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
2)fluoride .09 ppm
3)magnesium 12 ppm
5)sodium 14 ppm
Have no idea how to convert or solve this problem.
The easiest way is to remember this conversion factor. 1 ppm = 1 mg/L.
Therefore, 29 ppm Ca = 29 mg Ca/L. How many liters are in 3 pints?
29 mg Ca/L x ?? L = ??mg Ca.
The others are done the same way.
Check my thinking. Here is how you get the 1 ppm = 1 mg/L.
1 g/10^6 g = 1 ppm
Since density is same as pure water; i.e., 1.00 g/mL, then
1 g/10^6 mL = 1 ppm
1000 mg per 10^6 mL = 1 ppm.
Divide 1000 by 1000 and divide 10^6 by 1000 to obtain
1 mg per 10^3 mL = 1 ppm and
1 mg/L = 1 ppm. VOILA!