Chemical Forums
Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: poochiram on November 21, 2004, 12:39:28 PM
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How to convert 37 ppm Mg into moles?
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Show that you have attempt the problem before posting.
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ppm is a concentration unit. It cannot be converted to amount of matter (moles) directly.
You can calculate moles of substance in solution (or mixture) of known volume or mass.
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poochiram:
ppm = part per million
I guess you have a aqueous solution contains 37 ppm Mg
37 ppm Mg solution = 37 milligram of Mg in 1 L water.
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http://en.wikipedia.org/wiki/Parts_per_million
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ppm is a mass fraction. it is similar to percentage where u multiply the fraction by 100%. In ppm case, u multiply by 1 million.
ppm of a solute = (mass of solute) / (mass of solvent) x 106
37ppm of Mg tells u every million kg of solvent corresponds to 37kg of Mg. Given this information, you should above to work out its molar concentration by converting the required mass to moles.