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#1
04-08-2007, 06:32 PM
 Paola Guest Posts: n/a
mg/L to mmol/L

Hello everybody!!!

Does anyone knows how to convert from mg/L to mmol/L of nitirites, nitrates, ammonium and ortophosphates???
#2
04-09-2007, 01:50 AM
 Mrs X can't count, can't spell! Join Date: Feb 2006 Location: New Zealand Posts: 2,443 Rep Power: 12
Re: mg/L to mmol/L

g/L ÷ molar mass = mol/L

mg/L ÷ molar mass = mmol/L

remember to include the counter ion in your calculation as well, if it is included to start with.
#3
04-15-2007, 03:54 PM
 Paola Guest Posts: n/a
Re: mg/L to mmol/L

'What did you mean with "include the counter ion"???
#4
04-15-2007, 07:22 PM
 Mrs X can't count, can't spell! Join Date: Feb 2006 Location: New Zealand Posts: 2,443 Rep Power: 12
Re: mg/L to mmol/L

If you have a "nitrate" then it is something like "potassium nitrate", or "calcium nitrate", or "copper nitrate", etc. The metal ion (counter ion) may be included when converting from mols to grams. If you try something like Cu(No3)2 with and without the copper included, you will find it makes a big difference to your result.

I don't think this explains it very well, are you able to go to your tutors for more help? - Good luck with your studies.
#5
05-16-2007, 03:58 PM
 Unregistered Guest Posts: n/a
Re: mg/L to mmol/L

Mr X, I wish you were my tutor.
#6
10-24-2009, 10:50 PM
 Unregistered Guest Posts: n/a
Re: mg/L to mmol/L

does anyone here know how to convert mM to mg/L? any help would be greatly appreciated.
#7
10-25-2009, 04:05 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,550 Rep Power: 19
Re: mg/L to mmol/L

Quote:
 Originally Posted by Unregistered does anyone here know how to convert mM to mg/L? any help would be greatly appreciated.
M is an abbreviation for Molar, a concentration of 1 mole per liter. "mM" is millimolar, or millimole per liter.

You have to know what the dissolved substance is and its molar mass in grams per mole. Just multiply by the molar mass to get milligrams per liter.

Last edited by JohnS; 12-12-2013 at 11:24 AM.
#8
11-16-2009, 04:13 PM
 project Guest Posts: n/a
Re: mg/L to mmol/L

hey im bit confused. im making up solutions of micro molar/L and this is expressed as micro molar per litre . but i dont make them up in a litre do i. or do i break em down and make them up in any volumes i want?

right back

thank you
#9
11-17-2009, 07:56 AM
 Mrs X can't count, can't spell! Join Date: Feb 2006 Location: New Zealand Posts: 2,443 Rep Power: 12
Re: mg/L to mmol/L

Quote:
 Originally Posted by project hey im bit confused. im making up solutions of micro molar/L and this is expressed as micro molar per litre . but i dont make them up in a litre do i. or do i break em down and make them up in any volumes i want? right back thank you
Hi there, as long as the concentration is the same you can make them up in any size you need to. For example, if you want a 4µM solution, but you only want 100mL of it, then you use 0.4µmoles of material, and make this up to 100mL. Still the same concentration.
#10
11-26-2009, 06:43 AM
 Unregistered Guest Posts: n/a
Re: mg/L to mmol/L

I need to convert g/100ml into mmol/l and have become very confused, could anyone offer a helping hand? I became confused when someone mentioned molar mass!

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