Multiple Choice
Which of the following is the correct chemical formula for sodium sulfate?
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3. Chemical Reactions
Naming Ionic Compounds
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What is the correct name for the ionic compound with the formula NH_4_2S?
A
Ammonium sulfur
B
Ammonium sulfite
C
Ammonium sulfate
D
Ammonium sulfide
Verified step by step guidance1
Identify the ions present in the compound NH_4_2S. The formula contains NH_4^+ (ammonium ion) and S^{2-} (sulfide ion).
Recognize that NH_4^+ is a polyatomic cation called ammonium, and S^{2-} is the sulfide anion, which is the simple ion form of sulfur with a -2 charge.
Understand that the compound is formed by combining two ammonium ions (each with a +1 charge) to balance the charge of one sulfide ion (with a -2 charge), resulting in the formula (NH_4)_2S.
Recall the naming convention for ionic compounds: the cation name is stated first (ammonium), followed by the anion name (sulfide).
Conclude that the correct name for NH_4_2S is ammonium sulfide, as it consists of ammonium cations and sulfide anions.
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