What is the IUPAC name of the compound [Cr(NH3)6]Cl3?
Practice Questions
1 question
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
The correct IUPAC name is Hexaammine chromium(III) chloride, where 'ammine' indicates the ammonia ligands and chromium is in the +3 oxidation state.
Questions & Step-by-step Solutions
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Q
Q: What is the IUPAC name of the compound [Cr(NH3)6]Cl3?
Solution: The correct IUPAC name is Hexaammine chromium(III) chloride, where 'ammine' indicates the ammonia ligands and chromium is in the +3 oxidation state.
Steps: 8
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'.
