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What is the correct name for the compound FeCl_3?
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3. Chemical Reactions
Naming Ionic Compounds
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Which is the correct name for the compound CuCl?
A
Cupric chloride
B
Copper(II) chloride
C
Copper(I) chloride
D
Copper monochloride
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Identify the metal and its possible oxidation states. Copper (Cu) commonly exhibits +1 and +2 oxidation states in compounds.
Determine the charge on the chloride ion, which is always -1 in ionic compounds.
Since the formula is CuCl, there is one copper ion and one chloride ion, so the charges must balance: the copper ion must have a +1 charge to balance the -1 charge of chloride.
Use the Stock system for naming transition metal compounds, which indicates the oxidation state of the metal in Roman numerals in parentheses. Since copper is +1 here, the name is Copper(I) chloride.
Note that 'Cupric chloride' and 'Copper(II) chloride' refer to copper with a +2 charge, and 'Copper monochloride' is not the correct systematic name.
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