Multiple Choice
Which of the following is the correct chemical formula for table salt?
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3. Chemical Reactions
Naming Ionic Compounds
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How many bromide ions are needed to combine with one aluminum ion to form a neutral ionic compound?
A
3
B
4
C
1
D
2
Verified step by step guidance1
Identify the charge of the aluminum ion. Aluminum typically forms a cation with a charge of +3, written as Al^{3+}.
Identify the charge of the bromide ion. Bromide is the anion form of bromine and carries a charge of -1, written as Br^{-}.
To form a neutral ionic compound, the total positive charge must balance the total negative charge. Set up the equation: (charge of Al^{3+}) \times (number of Al ions) + (charge of Br^{-}) \times (number of Br ions) = 0.
Since we have one aluminum ion (Al^{3+}), let the number of bromide ions be x. The equation becomes: (3)(+1) + (-1)(x) = 0.
Solve for x to find the number of bromide ions needed to balance the +3 charge of one aluminum ion, ensuring the compound is electrically neutral.
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