Question

Write the chemical formula of the compound iron [II] hydroxide in a step-by-step manner.

Answer 1

The symbol of iron is ‘Fe’, having a valency of 2⁺.

The symbol of the formula is ‘OH’ with valency 1^-.

Step 1 –

Write the formula of iron [II] hydroxide:

Symbol Valency

Iron Fe 2⁺

Hydroxide OH 1^-

Step 2 –

Write each symbol with its valency:

Fe²⁺ OH^1-

Step 3 –

Interchanging the valencies:

$$\begin{gathered} \mathrm{Fe}\mathrm{OH} \\ \searrow \swarrow \\ {2}^{+}{1}^{-} \end{gathered}$$

The formula of the compound iron [II] hydroxide is Fe(OH)₂.