Question

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

Zinc hydroxide

Answer 1

Write the formula of

Zinc hydroxide	Symbol	valency
Zinc	\[\ce{Zn}\]	\[\ce{2^+}\]
Hydroxide	\[\ce{OH}\]	\[\ce{1^-}\]

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

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