Question

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

Aluminium hydroxide

Answer 1

Write the formula of

Aluminium hydroxide	Symbol	Valency
Aluminium	\[\ce{Al}\]	\[\ce{3^{+}}\]
Hydroxide	\[\ce{OH}\]	\[\ce{1^{-}}\]

Step I – Write each symbol with its valency.
Positive ion is written first
\[\ce{Al}^{3+}\]  \[\ce{[OH]}^{1-}\]
Step II – Interchange the valencies positive ion is written first.

The Formula is \[\ce{Al[OH]3}\]