Multiple Choice
What is the correct name for the ionic compound MgI_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 iron(III) hydroxide?
A
Fe(OH)3
B
Fe(OH)2
C
FeOH
D
Fe2O3
Verified step by step guidance1
Identify the oxidation state of iron in iron(III) hydroxide. The Roman numeral III indicates that iron has a +3 charge, so Fe is Fe^{3+}.
Recognize the hydroxide ion, OH^{-}, which has a charge of -1.
Determine the ratio of Fe^{3+} ions to OH^{-} ions needed to balance the overall charge to zero. Since Fe has a +3 charge and OH has a -1 charge, three hydroxide ions are needed to balance one Fe^{3+} ion.
Write the chemical formula by combining one Fe^{3+} ion with three OH^{-} ions, resulting in Fe(OH)_{3}.
Verify that the formula Fe(OH)_{3} is electrically neutral by confirming the total positive and negative charges cancel out.
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