Question

determine the chemical formula of the ionic compounds listed below with polyatomic ions: 1. barium nitrate 2. aluminum hydroxide 3. aluminum sulfate 4. magnesium phosphate 5. ammonium sulfate

Explanation:

Step1: Identify ions for barium nitrate

Barium ion is $Ba^{2 + }$ and nitrate ion is $NO_{3}^{-}$. To balance charges, we need 2 nitrate ions for 1 barium ion.

Step2: Write formula for barium nitrate

The chemical formula is $Ba(NO_{3})_{2}$.

Step3: Identify ions for aluminum hydroxide

Aluminum ion is $Al^{3+}$ and hydroxide ion is $OH^{-}$. We need 3 hydroxide ions for 1 aluminum ion to balance charges.

Step4: Write formula for aluminum hydroxide

The chemical formula is $Al(OH)_{3}$.

Step5: Identify ions for aluminum sulfate

Aluminum ion is $Al^{3+}$ and sulfate ion is $SO_{4}^{2 - }$. To balance charges, we need 2 aluminum ions and 3 sulfate ions.

Step6: Write formula for aluminum sulfate

The chemical formula is $Al_{2}(SO_{4})_{3}$.

Step7: Identify ions for magnesium phosphate

Magnesium ion is $Mg^{2+}$ and phosphate ion is $PO_{4}^{3 - }$. We need 3 magnesium ions and 2 phosphate ions to balance charges.

Step8: Write formula for magnesium phosphate

The chemical formula is $Mg_{3}(PO_{4})_{2}$.

Step9: Identify ions for ammonium sulfate

Ammonium ion is $NH_{4}^{+}$ and sulfate ion is $SO_{4}^{2 - }$. We need 2 ammonium ions for 1 sulfate ion to balance charges.

Step10: Write formula for ammonium sulfate

The chemical formula is $(NH_{4})_{2}SO_{4}$.

Answer:

1. $Ba(NO_{3})_{2}$
2. $Al(OH)_{3}$
3. $Al_{2}(SO_{4})_{3}$
4. $Mg_{3}(PO_{4})_{2}$
5. $(NH_{4})_{2}SO_{4}$