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Posted by on Friday, January 21, 2011 at 7:53pm.

Ex: [Cu] in river is 30 ppb, what is the molar concentration?

  • Environmental Science - , Friday, January 21, 2011 at 8:41pm

    30 grams per billion grams of solution. Well, assuming the density of water is 1000g/liter, then

    30/1E9 *1E3=30E-6 or 3E-5 parts per liter.

    Now, the moles of Cu in one liter:
    must be 30E-6/atomicmassCu=30/63.6 E-6

    or .47E-6 moles per liter, or M=.47microMolesperliter

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