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What is the IUPAC name of the compound [Cr(NH3)6]Cl3?

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Question: What is the IUPAC name of the compound [Cr(NH3)6]Cl3?

Options:

  1. Hexaammonium chromium(III) chloride
  2. Hexaammonia chromium(III) chloride
  3. Hexaammine chromium(III) chloride
  4. Hexaammonium chromium(II) chloride

Correct Answer: Hexaammine chromium(III) chloride

Solution: 

The correct IUPAC name is Hexaammine chromium(III) chloride, where \'ammine\' indicates the ammonia ligands and chromium is in the +3 oxidation state.

What is the IUPAC name of the compound [Cr(NH3)6]Cl3?

Practice Questions

Q1
What is the IUPAC name of the compound [Cr(NH3)6]Cl3?
  1. Hexaammonium chromium(III) chloride
  2. Hexaammonia chromium(III) chloride
  3. Hexaammine chromium(III) chloride
  4. Hexaammonium chromium(II) chloride

Questions & Step-by-Step Solutions

What is the IUPAC name of the compound [Cr(NH3)6]Cl3?
  • Step 1: Identify the central metal ion in the compound, which is chromium (Cr).
  • Step 2: Count the number of ammonia (NH3) ligands attached to the chromium. There are 6 ammonia ligands.
  • Step 3: The prefix 'hexa-' is used to indicate that there are 6 ligands. Therefore, we use 'Hexaammine' to describe the 6 ammonia ligands.
  • Step 4: Determine the oxidation state of chromium in the complex. Since there are 3 chloride ions (Cl-) and they each have a -1 charge, the total negative charge is -3.
  • Step 5: To balance the -3 charge from the chloride ions, chromium must be in the +3 oxidation state. Thus, we write 'chromium(III)' to indicate this.
  • Step 6: Combine the names of the ligands and the metal with its oxidation state. The full name is 'Hexaammine chromium(III)'.
  • Step 7: Finally, add the name of the counter ion (chloride) at the end. Since there are 3 chloride ions, we write 'chloride' as 'chloride' without any prefix.
  • Step 8: The complete IUPAC name of the compound is 'Hexaammine chromium(III) chloride'.
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