Question 3.7: Polyatomic Ions Name these ionic compounds, each of which co...
Polyatomic Ions
Name these ionic compounds, each of which contains a polyatomic ion:
(a) {\text{NaNO}}_{3} (b) {\text{CaCO}}_{3} (c) {({\text{NH}}_{4})}_{2}{\text{SO}}_{3} (d) {\text{NaH}}_{2}{\text{PO}}_{4}
Strategy
To name ionic compounds containing polyatomic ions (Table 3.4), name the positive ion first and then the negative ion, each as a separate word.
| Table 3.4 Names of Common Polyatomic Ions (Common names, where still widely used, are given in parentheses.) |
|||
| Name | Polyatomic Ion | Name | Polyatomic Ion |
| Hydrogen carbonate (bicarbonate) | {\text{HCO}_{3}}^{-} | Ammonium | {\text{NH}_{4}}^{+} |
| Sulfite | {\text{SO}_{3}}^{2-} | Hydroxide | {\text{OH}}^{-} |
| Hydrogen sulfite (bisulfite) | {\text{HSO}_{3}}^{-} | Nitrite | {\text{NO}_{2}}^{-} |
| Sulfate | {\text{SO}_{4}}^{2-} | Nitrate | {\text{NO}_{3}}^{-} |
| Hydrogen sulfate (bisulfate) | {\text{HSO}_{4}}^{-} | Acetate | \text{CH}_{3}\text{COO}^{-} or \text{C}_{2}\text{H}_{3}{\text{O}_{2}}^{-} |
| Perchlorate | {\text{ClO}_{4}}^{-} | ||
| Phosphate | {\text{PO}_{4}}^{3-} | Cyanide | {\text{CN}}^{-} |
| Hydrogen phosphate | \text{H}{\text{PO}_{4}}^{2-} | Permanganate | {\text{MnO}_{4}}^{-} |
| Dihydrogen phosphate | \text{H}_{2}{\text{PO}_{4}}^{-} | Chromate | {\text{CrO}_{4}}^{2-} |
| Dichromate | \text{Cr}_{2}{\text{O}_{7}}^{2-} | ||
(a) Sodium nitrate (b) Calcium carbonate
(c) Ammonium sulfite (d) Sodium dihydrogen phosphate
■ Quick Check 3.7
Name these ionic compounds, each of which contains a polyatomic ion:
(a) {\text{K}}_{2}{\text{HPO}}_{4} (b) {\text{Al}}_{2}{({\text{SO}}_{4})}_{3} (c) {\text{FeCO}}_{3}
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