Multiple Choice
Which of the following is the correct chemical formula for calcium nitrite?
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3. Chemical Reactions
Naming Ionic Compounds
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What is the correct name for the compound with the formula MgCrO4?
A
Magnesium chlorate
B
Magnesium chromate
C
Magnesium dichromate
D
Magnesium carbonate
Verified step by step guidance1
Identify the ions present in the compound MgCrO4. Magnesium (Mg) typically forms a +2 cation, Mg^{2+}.
Recognize the anion CrO4^{2-}, which is the chromate ion, not chlorate (ClO3^{-}) or carbonate (CO3^{2-}).
Since the charges of Mg^{2+} and CrO4^{2-} balance each other in a 1:1 ratio, the formula MgCrO4 corresponds to magnesium chromate.
Recall that magnesium dichromate would have the formula MgCr2O7, involving the dichromate ion Cr2O7^{2-}, which is different from chromate.
Therefore, the correct name for MgCrO4 is magnesium chromate, based on the combination of Mg^{2+} and CrO4^{2-} ions.
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