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Crystallization of Benzoic Acid

  1. Jan 14, 2009 #1
    Hi there,

    This may seem like weird question, but for my pre-lab this week I need to add along with intro and flow chart a table of reagents. now my only two reagents that I will be using is 2 g of crude Benzoic acid (including impurities) and water. in my table though, they ask for the # moles and density of applicable.

    since my 2 grams of crude benzoic acid is not pure, should I still convert it into # moles. My thinking is that I should not. Also for water, since I do not know exactly how much I will have to add during the boiling process, I believe I should not add this either.

    As for densities, since none were given in the lab manual - is it customary to use 1 g/mL for water and 1.32 g/mL for benzoic acid in its solid form?

  2. jcsd
  3. Jan 14, 2009 #2


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    Staff: Mentor

    I would convert benzoic to moles stating something like "maximum number of moles" to underline that it is not really true.
  4. Jan 14, 2009 #3
    That is what I was thinking should have been done. Thanks for the tip Borek.
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