Question

practice: ionic compounds with polyatomic ions
background
a polyatomic ion is a group of covalently bonded atoms that together have a charge. (the prefix poly-
means many.) since there is an ionic bond between the ions, the rules of ionic compounds from the first
ionic compound worksheet are followed. most polyatomic ions have a negative charge.
naming ionic compounds with polyatomic ions
write the name for each formula.

1. nh₄cl
2. cu(no₃)₂
3. sr(no₃)₂
4. lioh
5. caco₃
6. pbso₄
7. nano₂
8. kclo₃
9. nahco₃
10. baso₄
11. naoh
12. snco₃
13. na₂co₃
14. alpo₄

Explanation:

For naming ionic compounds with polyatomic ions:

• Identify the cation (positive ion) and the polyatomic anion (negative ion).
• For metals with variable charges (like \(Cu\), \(Pb\), \(Sn\)), determine the charge based on the anion's charge and the compound's overall neutrality.
• Use the names of the polyatomic ions (e.g., \(NH_4^+\) is ammonium, \(NO_3^-\) is nitrate, \(OH^-\) is hydroxide, \(CO_3^{2 - }\) is carbonate, \(SO_4^{2 - }\) is sulfate, \(NO_2^-\) is nitrite, \(ClO_3^-\) is chlorate, \(HCO_3^-\) is bicarbonate, \(PO_4^{3 - }\) is phosphate).

Answer:

1. Ammonium chloride
2. Copper(II) nitrate
3. Strontium nitrate
4. Lithium hydroxide
5. Calcium carbonate
6. Lead(II) sulfate
7. Sodium nitrite
8. Potassium chlorate
9. Sodium bicarbonate
10. Barium sulfate
11. Sodium hydroxide
12. Tin(II) carbonate
13. Sodium carbonate
14. Aluminum phosphate