ppm to Moles/Liter

cannonj22 · 05-14-2008, 02:39 AM

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,

cannonj22 · 05-14-2008, 02:42 AM

nevermind I think I found it. 1 ppm = 1mg/L. I never took analytical chemistry, is it obvious? Thanks, anyway.

KevinC · 05-14-2008, 01:14 PM

Quote:

Originally Posted by cannonj22

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

Jerseyfish · 05-14-2008, 02:42 PM

This post makes me smile.

honor · 05-14-2008, 03:07 PM

and degree general hardness is around 17mg/L

05-14-2008, 02:39 AM	#1 (permalink)
cannonj22 Algae Grower (View User Tanks) PTrader: (2) Join Date: Dec 2004 Location: Silver Spring, MD Posts: 53	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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05-14-2008, 02:42 AM	#2 (permalink)
cannonj22 Algae Grower (View User Tanks) PTrader: (2) Join Date: Dec 2004 Location: Silver Spring, MD Posts: 53	nevermind I think I found it. 1 ppm = 1mg/L. I never took analytical chemistry, is it obvious? Thanks, anyway.

05-14-2008, 02:42 PM	#4 (permalink)
Jerseyfish Algae Grower (View User Tanks) PTrader: (1) Join Date: May 2008 Location: Lodi, NJ Posts: 47	This post makes me smile.

05-14-2008, 03:07 PM	#5 (permalink)
honor Planted Tank Obsessed (View User Tanks) PTrader: (4) Join Date: Apr 2008 Location: Los Angeles California Posts: 379	and degree general hardness is around 17mg/L