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(NaCl) solutions used in intravenous injections have a concentration of 0.90% NaCl (mass/volume).

4.5grams of NaCl are needed to prepare 500.0 mL of this solution

How much water must evaporate from this solution to give a solution that is 9.0% NaCl (mass/volume)?

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asked by Tina
  1. a mL of water is a gram

    4.5 / x = .09

    x = 50 grams water remains

    so 450 grams evaporated

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    posted by Damon

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