Multiple Choice
Which of the following is the correct formula for the compound formed by lead(II) ions and chromate ions?
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3. Chemical Reactions
Writing Ionic Compounds
Multiple Choice
Which of the following is the correct chemical formula for a compound composed of aluminum ions and sulfate ions?
A
Al2(SO4)3
B
Al(SO4)3
C
Al3(SO4)2
D
AlSO4
Verified step by step guidance1
Identify the charges of the ions involved: aluminum ion is typically Al^{3+} and sulfate ion is SO_4^{2-}.
Determine the ratio of ions needed to balance the total positive and negative charges so that the compound is electrically neutral.
Set up the charge balance equation: 3 times the charge of aluminum ions plus 2 times the charge of sulfate ions should equal zero, i.e., 3(+3) + 2(-2) = 0.
From the charge balance, deduce the formula by combining 2 aluminum ions with 3 sulfate ions, resulting in Al_2(SO_4)_3.
Write the chemical formula with the correct subscripts to reflect the number of each ion in the compound: Al_2(SO_4)_3.
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