Question

IUPAC name of complex $K_3\left[Al\right(C_2{O}_4{)}_3]$ is:

• A. potassium alumino-oxalate
• B. potassium trioxalatoaluminate(III)
• C. potassium aluminium(III) oxalate
• D. potassium trioxalatoaluminate(VI)

Answer 1

The correct option is B potassium trioxalatoaluminate(III)

Given the complex $K_3\left[Al\right(C_2{O}_4{)}_3]$. Here, we know that $K$ has $1$ positive charge which means $3K$ has $3+$ charge.

So, the overall charge on $\left[Al\right(C_2{O}_4{)}_3]$ is $3-$. Since an oxalate group carries $-2$ charge, therefore $Al$ is in $+3$ oxidation state.
If the complex ion is an anion, the name of the metal ends with the suffix –ate.

Therefore, the IUPAC name of complex $K_3\left[Al\right(C_2{O}_4{)}_3]$ is potassium trioxalatoaluminate(III).