QUESTION IMAGE
Question
fill in the name and empirical formula of each ionic compound that could be formed from the ions in this table: cation: fe 3+, pb 4+, ca 2+; anion: cro 4 2-, so 4 2-, bro 3 -; some ionic compounds; empirical formula; name of compound
Step1: Recall ion - naming rules
Cations are named as the element name followed by the charge in Roman numerals if the metal has multiple oxidation states. Anions are named with an -ate or -ite suffix for polyatomic anions or -ide for simple anions.
Step2: Name the cations
$Fe^{3 + }$ is iron(III) ion, $Pb^{4+}$ is lead(IV) ion, $Ca^{2+}$ is calcium ion.
Step3: Name the anions
$CrO_{4}^{2 - }$ is chromate ion, $SO_{4}^{2 - }$ is sulfate ion, $BrO_{3}^{-}$ is bromate ion.
Step4: Determine empirical formulas
For a compound formed between a cation $M^{m+}$ and an anion $A^{n - }$, the empirical formula is $M_{n}A_{m}$ (the least - common - multiple method to balance the charges).
- For $Fe^{3+}$ and $CrO_{4}^{2 - }$, the empirical formula is $Fe_{2}(CrO_{4})_{3}$ and the name is iron(III) chromate.
- For $Fe^{3+}$ and $SO_{4}^{2 - }$, the empirical formula is $Fe_{2}(SO_{4})_{3}$ and the name is iron(III) sulfate.
- For $Fe^{3+}$ and $BrO_{3}^{-}$, the empirical formula is $Fe(BrO_{3})_{3}$ and the name is iron(III) bromate.
- For $Pb^{4+}$ and $CrO_{4}^{2 - }$, the empirical formula is $Pb(CrO_{4})_{2}$ and the name is lead(IV) chromate.
- For $Pb^{4+}$ and $SO_{4}^{2 - }$, the empirical formula is $Pb(SO_{4})_{2}$ and the name is lead(IV) sulfate.
- For $Pb^{4+}$ and $BrO_{3}^{-}$, the empirical formula is $Pb(BrO_{3})_{4}$ and the name is lead(IV) bromate.
- For $Ca^{2+}$ and $CrO_{4}^{2 - }$, the empirical formula is $CaCrO_{4}$ and the name is calcium chromate.
- For $Ca^{2+}$ and $SO_{4}^{2 - }$, the empirical formula is $CaSO_{4}$ and the name is calcium sulfate.
- For $Ca^{2+}$ and $BrO_{3}^{-}$, the empirical formula is $Ca(BrO_{3})_{2}$ and the name is calcium bromate.
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| Cation | Anion | Empirical Formula | Name of Compound |
|---|---|---|---|
| $Fe^{3 + }$ | $SO_{4}^{2 - }$ | $Fe_{2}(SO_{4})_{3}$ | iron(III) sulfate |
| $Fe^{3 + }$ | $BrO_{3}^{-}$ | $Fe(BrO_{3})_{3}$ | iron(III) bromate |
| $Pb^{4+}$ | $CrO_{4}^{2 - }$ | $Pb(CrO_{4})_{2}$ | lead(IV) chromate |
| $Pb^{4+}$ | $SO_{4}^{2 - }$ | $Pb(SO_{4})_{2}$ | lead(IV) sulfate |
| $Pb^{4+}$ | $BrO_{3}^{-}$ | $Pb(BrO_{3})_{4}$ | lead(IV) bromate |
| $Ca^{2+}$ | $CrO_{4}^{2 - }$ | $CaCrO_{4}$ | calcium chromate |
| $Ca^{2+}$ | $SO_{4}^{2 - }$ | $CaSO_{4}$ | calcium sulfate |
| $Ca^{2+}$ | $BrO_{3}^{-}$ | $Ca(BrO_{3})_{2}$ | calcium bromate |