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???

[Mrs X]

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.

'What did you mean with "include the counter ion"???

[Mrs X]

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.

Mr X, I wish you were my tutor.

does anyone here know how to convert mM to mg/L? any help would be greatly appreciated.

[JohnS]

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 divide by the molar mass to get milligrams per liter.

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

[Mrs X]

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.

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!