Multiple Choice
Which of the following is the correct chemical formula for the ionic compound sodium fluoride?
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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 chromate?
A
Al2(CrO4)3
B
Al2CrO4
C
AlCrO4
D
Al(CrO4)2
Verified step by step guidance1
Identify the charges of the ions involved: aluminum typically forms a +3 charge (Al^{3+}), and the chromate ion (CrO_4) has a -2 charge (CrO_4^{2-}).
Determine the ratio of aluminum ions to chromate ions needed to balance the overall charge to zero. Since Al^{3+} has a +3 charge and CrO_4^{2-} has a -2 charge, find the smallest whole number ratio where total positive charge equals total negative charge.
Set up the charge balance equation: 3 \times (charge \; of \; Al^{3+}) + 2 \times (charge \; of \; CrO_4^{2-}) = 0, which is 3 \times (+3) + 2 \times (-2) = 0.
From this ratio, write the chemical formula by placing the appropriate subscripts: 2 aluminum ions and 3 chromate ions, resulting in Al_2(CrO_4)_3.
Confirm that the formula is electrically neutral and correctly represents the combination of ions.
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