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Question
Write the chemical formula of the following compound in a step-by-step manner –
Calcium hydroxide
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Solution
Write the formula of
| Calcium hydroxide | Symbol | Valency |
| Calcium | \[\ce{Ca}\] | \[\ce2^+\] |
| Hydroxide | \[\ce{OH}\] | \[\ce1^-\] |
Step I – Write each symbol with its valency.
Positive ion is written first
\[\ce{Ca}^{2+}\] \[\ce{[OH]}^{1-}\]
Step II – Interchange the valencies and ignoring the positive and negative signs.
The Formula is \[\ce{Ca[OH]2}\]
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