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How to Write the Name for CoCl3

Learning to name chemical compounds requires that you:

  • Determine the type of compound you are working with.
  • Apply the rules for naming that type of compound.
  • Practice until it becomes second nature.
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For CoCl3 use the hints and resources below to help write the name.

Hint for Naming CoCl3

Metal (Co) + Non-metal (Cl) = Binary Ionic

But ... Co is a transition metal, so ...
  • Name the metal as it appears on the Periodic Table.
  • Name the non-metal (Chlorine) by replacing the ine with ide.
  • Look at the chemical formula to find the charge for Co. Since Cl has an ionic charge of -1, and we have three Cl atoms, Co will have to have a charge of +3 (so the net charge for the compound is zero). To show that we write (III) after the name for Co.

CoCl3 Resources