Question 8 Determine the name of each of the following ionic compounds: a. $$ \mathrm{FeCl}_{2} $$ b. $$ \mathrm{Al}_{2} \mathrm{O}_{3} $$ c. $$ \mathrm{Au}\left(\mathrm{NO}_{3}\right)_{3} $$ d. $$ \mathrm{Ba}(\mathrm{OH})_{2} $$ e. $$ \mathrm{H}_{2} \mathrm{~S} $$ f. $$ \mathrm{K}_{2} \mathrm{SO}_{3} $$

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a. **$$ \mathrm{FeCl}_{2} $$**  
1. Chloride has a $$-1$$ charge, and there are 2 chlorine atoms, contributing a total of $$-2$$.  
2. To neutralize the charge, iron must be in the $$+2$$ oxidation state.  
3. Thus, the name is **iron(II) chloride**.

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b. **$$ \mathrm{Al}_{2}\mathrm{O}_{3} $$**  
1. Oxygen has a $$-2$$ charge, and there are 3 oxygen atoms, contributing a total of $$-6$$.  
2. To neutralize the charge, 2 aluminum atoms must collectively contribute $$+6$$. Thus, each aluminum is $$+3$$.  
3. The compound is named **aluminum oxide**.

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c. **$$ \mathrm{Au}(\mathrm{NO}_{3})_{3} $$**  
1. The nitrate ion $$\mathrm{NO}_{3}^{-}$$ has a $$-1$$ charge.  
2. With 3 nitrate ions, the total negative charge is $$-3$$.  
3. Gold must have a $$+3$$ oxidation state to balance the charge.  
4. The compound is named **gold(III) nitrate**.

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d. **$$ \mathrm{Ba}(\mathrm{OH})_{2} $$**  
1. The hydroxide ion $$\mathrm{OH}^{-}$$ carries a $$-1$$ charge.  
2. With 2 hydroxide ions, the total negative charge is $$-2$$.  
3. Barium typically has a $$+2$$ charge, balancing the compound.  
4. The compound is named **barium hydroxide**.

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e. **$$ \mathrm{H}_{2}\mathrm{S} $$**  
1. Although the formula might suggest an ionic compound, $$ \mathrm{H}_{2}\mathrm{S} $$ is in fact a covalent (molecular) compound.  
2. It is commonly known as **hydrogen sulfide**.

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f. **$$ \mathrm{K}_{2}\mathrm{SO}_{3} $$**  
1. Potassium $$\mathrm{K}$$ has a $$+1$$ charge, and with 2 potassium atoms, the total is $$+2$$.  
2. The sulfite ion $$\mathrm{SO}_{3}^{2-}$$ has a $$-2$$ charge.  
3. The compound is named **potassium sulfite**.
a. **Iron(II) chloride** b. **Aluminum oxide** c. **Gold(III) nitrate** d. **Barium hydroxide** e. **Hydrogen sulfide** f. **Potassium sulfite**

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