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posted by  meg23 on 9/4/2008 8:51:53 AM  |  status: Live  

HELP=LIFESAVER PTS!

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A solution is found to be 0.0398% by weight FeF2. What is the concentration of the F1- ion expressed in ppm?
ppm

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posted by Werner on 9/4/2008 12:07:38 PM  |  status: Live
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meg23's comment:
"thank you soooo much!!!"
Response Details:
  Given that
   % of FeF2 = 0.0398 %
  That means 100 g of solution contains 0.0398 g of FeF2
   The mass of F- present in 0.0398 g of FeF2 = 0.0398g*(38g/mol)/(93.845g/mol)
                                                                      = 0.0161 g
  ∴ The mass of F- present in million g of solution = (0.0161 g/100g) *106 g
                                                                           = 161 g F-  / million g of solution
                                                                           = 161 ppm
   Hence the concentration of F-  = 161 ppm
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