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Which of the following is the correct chemical formula for copper(I) sulfide?
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3. Chemical Reactions
Naming Ionic Compounds
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Which is the correct name for the compound CoCO_3?
A
Cobalt carbonite
B
Cobalt carbonate
C
Cobalt(II) carbonate
D
Cobalt(III) carbonate
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Identify the ions present in the compound CoCO_3. The compound consists of the metal cobalt (Co) and the polyatomic ion carbonate (CO_3^{2-}).
Determine the charge on the carbonate ion, which is known to be 2-. This means the cobalt ion must balance this charge to make the compound neutral.
Since there is one carbonate ion with a charge of 2-, cobalt must have a charge of +2 to balance the overall charge to zero.
Use the stock nomenclature system to name the compound, which includes the metal name followed by its oxidation state in Roman numerals in parentheses. Here, cobalt has a +2 charge, so it is named cobalt(II).
Combine the metal name with the polyatomic ion name to get the full name: cobalt(II) carbonate.
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