Question

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

Potassium sulphate

Answer 1

Write the formula of

Potassium sulphate	Symbol	valency
Potassium	\[\ce{K}\]	\[\ce{1^+}\]
sulphate	\[\ce{SO4}\]	\[\ce{2^-}\]

Step I – Write each symbol with its valency.
Positive ion is written first
\[\ce{K}^{1+}\]  \[\ce{[SO4]}^{2-}\]
Step II – Interchange the valencies and ignoring signs.

The Formula is \[\ce{K2SO4}\]