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How to build a model with water, ion and crystal

Hi, I am starting to use Avogadro to build MD model. I want to build a water box with several type of ions (Cu2+,SO42-…) and crystal inside the box. I think this task could divided into these procedures:

  1. Build a box larger than a supercell of crystal.
  2. Fill water in the box.
  3. Add ion into water. Then user energy minimization.
    How to do these procedures. Any suggestion is appreciated. Thank you.
    Best regard.