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Question
Write the chemical formula of the following compound in a step-by-step manner –
Sodium zincate
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Solution
Write the formula of
| Sodium zincate | Symbol | Valency |
| Sodium | \[\ce{Na}\] | \[\ce{1^{+}}\] |
| Zincate | \[\ce{ZnO2}\] | \[\ce{2^{-}}\] |
Step I – Write each symbol with its valency.
Positive ion is written first
\[\ce{Na}^{1+}\] \[\ce{[ZnO2]}^{2-}\]
Step II – Interchange the valencies ignoring (+) and (−) signs.
The Formula is \[\ce{Na2ZnO2}\]
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