ppm to Moles/Liter - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 05-14-2008, 02:39 AM Thread Starter
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ppm to Moles/Liter

Hi everyone,

Is there a convenient easy to use site, online calculator, or even conversion factor for converting ppm to molarity? I have trouble thinking in terms of parts per million, but I can think of things in terms of molarity very easily.

Thanks in advance,
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post #2 of 5 (permalink) Old 05-14-2008, 02:42 AM Thread Starter
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nevermind I think I found it. 1 ppm = 1mg/L. I never took analytical chemistry, is it obvious? Thanks, anyway.
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post #3 of 5 (permalink) Old 05-14-2008, 01:14 PM
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Quote:
Originally Posted by cannonj22 View Post
nevermind I think I found it. 1 ppm = 1mg/L. I never took analytical chemistry, is it obvious? Thanks, anyway.
Well, that doesn't yet give you moles/liter. You next divide by the formula/molecular/atomic weight (in grams/mole) to give millimoles per liter. Then divide by 1000 for moles/liter. A calculator would need to still know which chemical you are converting.
And in the case of nitrate/nitrite/ammonia you need to know if it is expressed as mg N per L or mg NO3/NO2/NH4 per L.

Kevin

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post #4 of 5 (permalink) Old 05-14-2008, 02:42 PM
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post #5 of 5 (permalink) Old 05-14-2008, 03:07 PM
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and degree general hardness is around 17mg/L
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