Multiple Choice
Which of the following is the correct chemical formula for lithium phosphate?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct formula for the compound formed by iron(II) ions and chromate ions?
A
Fe2(CrO4)3
B
Fe2CrO4
C
FeCrO4
D
Fe(CrO4)2
Verified step by step guidance1
Identify the charges of the ions involved: iron(II) ion is Fe^{2+} and chromate ion is CrO_4^{2-}.
Since Fe^{2+} has a charge of +2 and CrO_4^{2-} has a charge of -2, the charges are equal in magnitude but opposite in sign.
To form a neutral compound, the total positive charge must balance the total negative charge.
Because the charges are equal and opposite, one Fe^{2+} ion will pair with one CrO_4^{2-} ion to balance the charges.
Therefore, the formula of the compound is FeCrO_4, indicating a 1:1 ratio of iron(II) ions to chromate ions.
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