Question

iron(iii) hydroxide express your answer as a chemical formula.

Explanation:

Step1: Identify ions

Iron(III) is $Fe^{3+}$, hydroxide is $OH^-$.

Step2: Balance charges

To balance $3+$ and $1-$, need 3 $OH^-$. So formula is $Fe(OH)_3$.

Answer:

$\boldsymbol{Fe(OH)_3}$