Question

Write the chemical formula of the following compound in a step-by-step manner –

Iron [II] hydroxide

Answer 1

Write the formula of

Iron [II] hydroxide	Symbol	Valency
Iron	\[\ce{Fe}\]	\[\ce{2^{+}}\]
Hydroxide	\[\ce{OH}\]	\[\ce{1^{-}}\]

Step I – Write each symbol with its valency.
Positive ion is written first
\[\ce{Fe}^{2+}\]  \[\ce{[OH]}^{1-}\]
Step II – Interchange the valencies ignoring signs.

The Formula is \[\ce{Fe[OH]2}\]