Multiple Choice
What is the correct chemical formula for manganese(VII) arsenide?
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3. Chemical Reactions
Naming Ionic Compounds
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What is the correct IUPAC name for the compound Co(NO3)2?
A
Cobalt(III) nitrate
B
Cobalt nitrite
C
Cobalt(II) nitrate
D
Cobalt dinitrate
Verified step by step guidance1
Identify the metal and its oxidation state in the compound Co(NO3)2. Cobalt (Co) is the metal, and nitrate (NO3) is the polyatomic ion.
Determine the charge of the nitrate ion. The nitrate ion (NO3) has a charge of -1.
Since there are two nitrate ions, the total negative charge contributed by the nitrate ions is 2 × (-1) = -2.
To balance the charges, cobalt must have a +2 charge, so the oxidation state of cobalt in this compound is +2.
Use the IUPAC naming convention for transition metal compounds: name the metal followed by its oxidation state in Roman numerals in parentheses, then the name of the anion. Therefore, the correct name is Cobalt(II) nitrate.
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