Editing Naming Ionic Compounds With Polyatomic Ions
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<center><b>Chemistry - Naming Ionic Compounds with Polyatomic Ions</b></center><br> <b>A. Chemical Name to Chemical Formula</b><br> 1. Write down the symbol(s) and charge of cation, then the anion. <br> 2a. The number of positive ions has to equal the number of negative ions. <br> 2b. Determine the number of each ion to make the charges equal. <br> 3. To get correct chemical formula **Each # of ions will be the subscript of the ion in the final chemical formula. **When writing chemical formula, never shows charges of ions. **<b>All polyatomic ions need to have parentheses around them and a subscript (even if it is 1)</b>.<br> <i>Example: Sodium sulfate</i><br> Step 1 Na<sup>1+</sup> <nowiki>SO</nowiki><sub>4</sub><sup>2-</sup><br> Step 2 Need two cations, Na<sup>1+</sup>, Na<sup>1+</sup>,and one anion, <nowiki>SO</nowiki><sub>4</sub><sup>2-</sup><br> Step 3 Na<sub>2</sub><nowiki>(SO</nowiki><sub>4</sub>)<sub>1</sub><br> <i>More Examples:</i> Magnesium nitrate, Ammonium phosphate {Answer: Mg<sub>1</sub><nowiki>(NO</nowiki><sub>3</sub>)<sub>2</sub>, <nowiki>(NH</nowiki><sub>4</sub>)<sub>3</sub><nowiki>(PO</nowiki><sub>4</sub>)<sub>1</sub>}<br> <b>B. Chemical Formula to Chemical Name</b><br> <br> 1. Write down the chemical name for the cation (always first part). (it will be the first word, <b>1st letter is capitalized</b>).<br> 2. Write down the chemical name for the anion (always second part). (it will be second word, <b>Never Capitalized</b>).<br> <i>Example</i>: Ca<sub>1</sub><nowiki>(OH</nowiki>)<sub>2</sub><br> Step 1 Calcium <br> Step 2 Calcium hydroxide<br> <i>More Example</i>: Li<sub>2</sub><nowiki>(SO</nowiki><sub>3</sub>)<sub>1</sub> (Answer: Lithium sulfite)<br>
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