what is the name of this coordination compound [CoSO4(NH3)5]Br?
my attempt:
cobaltsulfatepentaamine Bromine
To name the coordination compound, we need to understand the rules for naming coordination compounds.
1. Identify the central metal ion: In this case, it is cobalt (Co).
2. Identify and name the ligands: Ligands are the molecules or ions that are attached to the central metal ion. In the compound [CoSO4(NH3)5]Br, the ligands are sulphate (SO4), ammonia (NH3), and bromide (Br-).
3. Determine the oxidation state of the metal ion: In the complex, the oxidation state of cobalt can be calculated by considering the charges of the ligands. Sulphate (SO4) has a charge of -2, bromide (Br-) has a charge of -1, and ammonia (NH3) has no charge. Therefore, we have:
-2 (from SO4) + x (from Co) + 0 (from NH3) + (-1) (from Br-) = 0
Simplifying the equation, we have -2 + x - 1 = 0, which gives us x = +3. Hence, the oxidation state of cobalt is +3.
4. Write the name of the compound: Now that we have all the information, we can write the name. The steps are as follows:
a) Start with the name of the ligands in alphabetical order (ignoring prefixes such as mono-, di-, tri-, etc.). Here, we have ammonia (NH3), sulphate (SO4), and bromide (Br-).
b) Write the name of the central metal ion, followed by its oxidation state in Roman numerals within parentheses. In this case, it is cobalt (Co) with an oxidation state of +3.
c) Add the prefixes indicating the number of each ligand. Since there are five ammonia ligands, we use the prefix "penta-" before "ammine."
d) Finally, add the name of the anion, which is bromide (Br-).
Putting it all together, the name of the coordination compound [CoSO4(NH3)5]Br is "pentaamminecobalt(III) sulfate bromide."