Fill in the name and empirical formula of each ionic compound that could be formed from the ions.
| Some ionic compounds |
| --- | --- | --- | --- |
| cation | anion | empirical formula | name of compound |
| [tex]Cr ^{2+}[/tex] | [tex]SO _4^{2-}[/tex] | | |
| [tex]Mg ^{2+}[/tex] | [tex]C _2 H _3 O _2^{-}[/tex] | | |
| [tex]Na ^{+}[/tex] | [tex]IO _2^{-}[/tex] | | |
Answer (2)
C r 2 + and S O 4 2 − form C r S O 4 , named Chromium(II) sulfate.
M g 2 + and C 2 H 3 O 2 − form M g ( C 2 H 3 O 2 ) 2 , named Magnesium acetate.
N a + and I O 2 − form N a I O 2 , named Sodium iodite.
The empirical formulas and names of the ionic compounds are determined by balancing the charges of the ions. C r S O 4 , M a g n es i u m acetate , N a I O 2
Explanation
Problem Analysis We are asked to determine the empirical formulas and names of the ionic compounds formed from the given cations and anions. We need to balance the charges of the ions to find the empirical formula and then name the compound accordingly.
Chromium(II) Sulfate For C r 2 + and S O 4 2 − , the charges are +2 and -2, respectively. Since the charges are equal and opposite, they balance in a 1:1 ratio. Therefore, the empirical formula is C r S O 4 . The name of the compound is Chromium(II) sulfate because chromium has a +2 charge.
Magnesium Acetate For M g 2 + and C 2 H 3 O 2 − , the charges are +2 and -1, respectively. To balance the charges, we need two acetate ions ( C 2 H 3 O 2 − ) for each magnesium ion ( M g 2 + ). Thus, the empirical formula is M g ( C 2 H 3 O 2 ) 2 . The name of the compound is Magnesium acetate.
Sodium Iodite For N a + and I O 2 − , the charges are +1 and -1, respectively. Since the charges are equal and opposite, they balance in a 1:1 ratio. Therefore, the empirical formula is N a I O 2 . The name of the compound is Sodium iodite.
Final Answer The empirical formulas and names of the ionic compounds are:
C r S O 4 : Chromium(II) sulfate
M g ( C 2 H 3 O 2 ) 2 : Magnesium acetate
N a I O 2 : Sodium iodite
Examples
Ionic compounds are used in various applications in everyday life. For example, sodium chloride (NaCl), also known as table salt, is used to season food. Magnesium sulfate ( M g S O 4 ), also known as Epsom salt, is used in bath salts to soothe muscles. Calcium carbonate ( C a C O 3 ) is used in antacids to neutralize stomach acid. Understanding how to name and formulate ionic compounds is essential in chemistry and related fields.
The empirical formulas and names of the ionic compounds formed are: C r S O 4 (Chromium(II) sulfate), M g ( C 2 H 3 O 2 ) 2 (Magnesium acetate), and N a I O 2 (Sodium iodite). Each compound is formed by balancing the charges of the respective ions. The names reflect the oxidation states of the cations involved.
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