Trigonal planar (triangle)
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Carbonic acid, H2CO3
K2CO3 Potassium carbonate
Carbon trioxide?..or Carbonate with a 2-? If Carbonate, then it is trigonal planar.
The molecular geometry of the compound CO32- is trigonal planar. It has a single atom of carbon bound to three atoms of oxygen.
(Don't forget to balance it) The precipitate here has to be 2NaCl, as Ca(CO3)2 technically dissolves.