Multiple Choice
What is the correct IUPAC name for the compound Co(NO3)2?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for aluminum perbromate?
A
AlBr3
B
Al(BrO3)3
C
Al2(BrO4)3
D
Al(BrO4)3
Verified step by step guidance1
Identify the ions involved in the compound. Aluminum typically forms a +3 cation, written as Al^{3+}.
Determine the anion from the name 'perbromate.' The perbromate ion is BrO_4^{-}, which carries a -1 charge.
Balance the total positive and negative charges to form a neutral compound. Since Al^{3+} has a +3 charge and BrO_4^{-} has a -1 charge, three perbromate ions are needed to balance one aluminum ion.
Write the chemical formula by placing the aluminum ion first, followed by the perbromate ion in parentheses with a subscript of 3 to indicate three perbromate ions: Al(BrO_4)_3.
Verify that the total charge is zero: +3 from Al^{3+} and 3 × (-1) from BrO_4^{-} equals zero, confirming the formula is correct.
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