Multiple Choice
Which of the following correctly identifies the symbol and name of the cation present in table salt?
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3. Chemical Reactions
Naming Ionic Compounds
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What is the chemical formula for copper(II) sulfate?
A
Cu2SO4
B
CuSO4
C
Cu2(SO4)3
D
CuSO3
Verified step by step guidance1
Identify the oxidation state of copper in copper(II) sulfate. The (II) indicates copper has a +2 charge, written as Cu^{2+}.
Recognize the sulfate ion, which is a polyatomic ion with the formula SO_4^{2-} and a charge of -2.
Since copper has a +2 charge and sulfate has a -2 charge, they combine in a 1:1 ratio to balance the charges.
Write the chemical formula by placing the copper ion and sulfate ion together without any additional subscripts, resulting in CuSO_4.
Verify that the overall charge of the compound is neutral by confirming that the positive and negative charges cancel each other out.
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