Fill in the name and empirical formula of each ionic compound that could be formed from the ions in this table:
| cation | anion | empirical formula | name of compound |
|---|---|---|---|
| [tex]Ca ^{2+}[/tex] | [tex]CH _3 CO _2^{-}[/tex] | | |
| [tex]K ^{+}[/tex] | [tex]BrO _3^{-}[/tex] | | |
| [tex]Na ^{+}[/tex] | [tex]BrO _4^{-}[/tex] | | |
Answer (2)
Determine the empirical formula by balancing the charges of the cation and anion.
Name the compound by stating the name of the cation followed by the name of the anion.
The empirical formula for calcium acetate is C a ( C H 3 C O 2 ) 2 and its name is calcium acetate.
The empirical formula for potassium bromate is K B r O 3 and its name is potassium bromate.
The empirical formula for sodium perbromate is N a B r O 4 and its name is sodium perbromate.
The completed table is:
cation
anion
empirical formula
name of compound
C a 2 +
C H 3 C O 2 −
C a ( C H 3 C O 2 ) 2
calcium acetate
K +
B r O 3 −
K B r O 3
potassium bromate
N a +
B r O 4 −
N a B r O 4
sodium perbromate
Explanation
Problem Analysis We are given a table with cations and anions and asked to fill in the empirical formula and name of each ionic compound that could be formed.
Calcium Acetate For C a 2 + and C H 3 C O 2 − , we need two acetate ions to balance the +2 charge of calcium. Therefore, the empirical formula is C a ( C H 3 C O 2 ) 2 . The name of the compound is calcium acetate.
Potassium Bromate For K + and B r O 3 − , the charges are already balanced (+1 and -1). The empirical formula is K B r O 3 . The name of the compound is potassium bromate.
Sodium Perbromate For N a + and B r O 4 − , the charges are already balanced (+1 and -1). The empirical formula is N a B r O 4 . The name of the compound is sodium perbromate.
Final Answer Therefore, the completed table is:
cation
anion
empirical formula
name of compound
C a 2 +
C H 3 C O 2 −
C a ( C H 3 C O 2 ) 2
calcium acetate
K +
B r O 3 −
K B r O 3
potassium bromate
N a +
B r O 4 −
N a B r O 4
sodium perbromate
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. Calcium carbonate (CaCO3) is used in antacids to neutralize stomach acid. Potassium iodide (KI) is added to table salt to prevent iodine deficiency. Understanding the formation and naming of ionic compounds is essential in chemistry and related fields.
The ionic compounds formed from the given cations and anions are calcium acetate, potassium bromate, and sodium perbromate. Their empirical formulas are Ca(CH_3CO_2)_2, KBrO_3, and NaBrO_4, respectively. Each name refers directly to the corresponding cation followed by the anion.
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