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Question
Write the chemical formula of the following compound in a step-by-step manner –
Iron [II] hydroxide
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Solution
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 \[\ce{Fe[OH]2}\]
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