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Homework Help: Stearic acid problem

  1. Nov 8, 2006 #1
    Hi,

    I have two questions that I am stuck on involving stearic acid solutions.


    1a) 0.01mL of a solution containing 2 grams per litre of stearic acid in acetone is used. What mass of stearic acid is present in this drop of solution?


    Solution:

    0.01ML solution X (1L/1000mL solution) X 2g stearic acid/1L solution
    = 2 x 10^-5 g


    1b)The density of stearic acid is 0.9408g/mL. What will be the volume of stearic acid left from the drop of solution when all the acetone is evaporated?

    Solution:

    .00002g stearic acid X (1mL/0.9408g stearic acid) X (1L/1000mL)
    = 2 x 10^-8 L

    These are the best solutions I could come up with but I have a feeling both are incorrect. Any help would be appreciated.

    thank you.
     
  2. jcsd
  3. Nov 8, 2006 #2
    Both look fine.
     
  4. Nov 10, 2006 #3
    Thank You!
     
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