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September 19, 2014

September 19, 2014

Posted by **Susan** on Sunday, September 7, 2008 at 4:20pm.

1) calcium 29 ppm

2)fluoride .09 ppm

3)magnesium 12 ppm

4)potassium 3.4ppm

5)sodium 14 ppm

Have no idea how to convert or solve this problem.

- Chemistry -
**DrBob222**, Sunday, September 7, 2008 at 6:11pmThe 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!

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