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Dear convert-me.com forum visitors,
Our forum has been available for many years. In September 2014 we decided to switch it to read-only mode. Month after month we saw less posts with questions and answers from real people and more spam posts. We were spending more and more resources cleaning the spam until there were less them 1 legitimate message per 100 spam posts. Then we decided it's time to stop.
All the posts in the forum will be available and searchable. We understand there are a lot of useful information and we aren't going to remove anything. As for the new questions, you can always ask them on convert-me.com FaceBook page
Thank you for being with us and sorry for any inconveniences this could caused.
2 posts
• Page 1 of 1
by Guest » Sun Apr 17, 2005 7:02 pm
I assume you mean mol/dm^3. ( 1 dm^3 = 1 L).
Steps:
1) Convert the moles in the numerator to grams. You have to know the molecular weight of the substance, or add up all the atomic weights of the atoms which make up the molecule. Multiple the moles by that number of grams per mole.
2) Convert the volume of solvent to grams by multiplying by it's density (water is roughly 1000 g/L although it varies slightly with temperature.
3) finally ppm (based on mass ratio) = (grams substance/grams solvent) x 10^6
Steps:
1) Convert the moles in the numerator to grams. You have to know the molecular weight of the substance, or add up all the atomic weights of the atoms which make up the molecule. Multiple the moles by that number of grams per mole.
2) Convert the volume of solvent to grams by multiplying by it's density (water is roughly 1000 g/L although it varies slightly with temperature.
3) finally ppm (based on mass ratio) = (grams substance/grams solvent) x 10^6
- Guest
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2 posts
• Page 1 of 1