Multiple Choice
Which type of compound is a salt?
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3. Chemical Reactions
Naming Ionic Compounds
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What is the correct name of the compound Mn_3(PO_4)_2?
A
Manganese phosphate
B
Manganese(II) diphosphate
C
Manganese(II) phosphate
D
Manganese(III) phosphate
Verified step by step guidance1
Identify the cation and anion in the compound Mn_3(PO_4)_2. Here, Mn is the cation (manganese) and PO_4 is the polyatomic anion phosphate.
Determine the charge of the phosphate ion, which is PO_4^{3-}. Since there are two phosphate ions, the total negative charge is 2 \times (-3) = -6.
To balance the total negative charge of -6, the total positive charge from manganese ions must be +6. Since there are 3 manganese ions, each manganese ion must have a charge of +2.
Use the charge of the manganese ion to write the correct name with the oxidation state in Roman numerals: Manganese(II).
Combine the cation and anion names to form the full compound name: Manganese(II) phosphate.
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