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Identify precipated

  1. Sep 28, 2014 #1
    I have made a precipitate that I would like to know the composition of but I'm not a chemist so maybe some of you can help. If you dissolve soap, specifically ivory soap in hot water so that it is saturated with soap and then if you pour into that a solution of ferrous sulfate dissolved in water, a precipitate will form. This grey colored precipitate after it dries turns a red color so I assume it is some form of iron oxide but what exactly would it's composition be?
  2. jcsd
  3. Sep 29, 2014 #2


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    Staff: Mentor

    I bet it is some mixture, and the exact composition will depend on the exact composition of the ivory soap.

    Ferrous salt of fatty acids seem to be the most obvious culprit.
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