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?
Hexaammonium chromium(III) chloride
Hexaammonia chromium(III) chloride
Hexaammine chromium(III) chloride
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'.
