Multiple Choice
In the ionic compound aluminum hydroxide, Al(OH)_3, how many hydroxide ions are bonded to each aluminum ion?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for chromium(II) hydroxide?
A
Cr2O3
B
Cr(OH)2
C
Cr2(OH)3
D
Cr(OH)3
Verified step by step guidance1
Identify the oxidation state of chromium in chromium(II) hydroxide. The Roman numeral II indicates that chromium has a +2 charge.
Recall that the hydroxide ion (OH) has a charge of -1.
To form a neutral compound, the total positive charge from chromium ions must balance the total negative charge from hydroxide ions.
Since chromium is +2 and hydroxide is -1, one chromium ion will pair with two hydroxide ions to balance the charges, giving the formula $\mathrm{Cr(OH)_2}$.
Verify that the other options do not balance charges correctly or represent different oxidation states or compounds.
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