Multiple Choice
Which of the following is the correct chemical formula for iron(III) oxide?
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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 hydroxide?
A
Al2(OH)3
B
Al2O3
C
Al(OH)3
D
AlOH
Verified step by step guidance1
Step 1: Identify the ions involved. Aluminum typically forms a +3 charge ion, written as Al^{3+}, and the hydroxide ion is OH^{-} with a -1 charge.
Step 2: Determine the ratio of ions needed to balance the charges. Since aluminum has a +3 charge and hydroxide has a -1 charge, you need three hydroxide ions to balance one aluminum ion.
Step 3: Write the chemical formula by combining one aluminum ion with three hydroxide ions, resulting in Al(OH)_{3}.
Step 4: Check the other options to see if they correctly represent the compound. For example, Al2(OH)3 would imply two aluminum ions and three hydroxide ions, which does not balance the charges properly.
Step 5: Conclude that the correct formula for aluminum hydroxide is Al(OH)_{3}, as it correctly balances the charges of the ions involved.
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