Dissolve Plaster of Paris

  1. My groupmates and I were using plaster of paris for our Arch 10 scale model of a chair. We used a glass casserole for the first trial. Kind of stupid. We covered it with oil before putting in the mixture but when the mixture dried, we couldn't get it out anymore. How can I dissolve plaster of paris?
     
  2. jcsd
  3. chemisttree

    chemisttree 3,721
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    Water and time will eventually get it out. Acid or sugar will accelerate it somewhat.

    You can convert the dihydrate back to the hemihydrate by baking it at 150F for several, perhaps many, hours. It should then crumble easily.
     
  4. An estimate of how long?
     
  5. chemisttree

    chemisttree 3,721
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