Fill in the name and empirical formula of each ionic compound that could be formed from the ions:
| cation | anion | empirical formula | name of compound |
|---|---|---|---|
| [tex]Fe ^{3+}[/tex] | [tex]NO _2^{-}[/tex] | | |
| [tex]K ^{+}[/tex] | [tex]SO _4^{2-}[/tex] | | |
| [tex]Fe ^{2+}[/tex] | [tex]CH _3 CO _2^{-}[/tex] | | |
Answer (2)
The empirical formula for the compound formed from F e 3 + and N O 2 − is F e ( N O 2 ) 3 , and its name is iron(III) nitrite.
The empirical formula for the compound formed from K + and S O 4 2 − is K 2 S O 4 , and its name is potassium sulfate.
The empirical formula for the compound formed from F e 2 + and C H 3 C O 2 − is F e ( C H 3 C O 2 ) 2 , and its name is iron(II) acetate.
The completed table is shown below.
cation
anion
empirical formula
name of compound
F e 3 +
N O 2 −
F e ( N O 2 ) 3
iron(III) nitrite
K +
S O 4 2 −
K 2 S O 4
potassium sulfate
F e 2 +
C H 3 C O 2 −
F e ( C H 3 C O 2 ) 2
iron(II) acetate
b o x e d
Explanation
Understanding the Problem We are given a table with three ionic compounds to be formed from given cations and anions. For each compound, we need to determine the empirical formula and the name of the compound. The cations are F e 3 + , K + , and F e 2 + . The anions are N O 2 − , S O 4 2 − , and C H 3 C O 2 − .
Determining the First Compound For the first compound, the ions are F e 3 + and N O 2 − . To balance the charges, we need three N O 2 − ions for each F e 3 + ion. Thus, the empirical formula is F e ( N O 2 ) 3 . The name of the compound is iron(III) nitrite.
Determining the Second Compound For the second compound, the ions are K + and S O 4 2 − . To balance the charges, we need two K + ions for each S O 4 2 − ion. Thus, the empirical formula is K 2 S O 4 . The name of the compound is potassium sulfate.
Determining the Third Compound For the third compound, the ions are F e 2 + and C H 3 C O 2 − . To balance the charges, we need two C H 3 C O 2 − ions for each F e 2 + ion. Thus, the empirical formula is F e ( C H 3 C O 2 ) 2 . The name of the compound is iron(II) acetate.
Examples
Ionic compounds are used in various applications, such as in batteries, fertilizers, and medicines. For example, sodium chloride (NaCl), commonly known as table salt, is an ionic compound essential for human health. Understanding how ionic compounds are formed and named is crucial in chemistry for predicting the properties and reactions of these compounds.
The empirical formulas and names of the ionic compounds are as follows: F e ( N O 2 ) 3 , iron(III) nitrite; K 2 S O 4 , potassium sulfate; F e ( C H 3 C O 2 ) 2 , iron(II) acetate. Each formula has been derived by balancing the charges of the respective cations and anions. This table summarizes the information accurately.
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