The compound Co(CH3COO)2 is an ionic compound. What are the ions of which it is composed? Cation formula Anion formula [Review Topics] [Reference] Use the References to access important values if needed for What is the name of the compound with the formula BaF2? What is the name of the compound with the formula AlBr3? What is the name of the compound with the formula Na2O?
The Correct Answer and Explanation is:
Answers:
- Compound: Co(CH₃COO)₂
- Cation formula: Co²⁺
- Anion formula: CH₃COO⁻ (acetate)
- Name of BaF₂: Barium fluoride
- Name of AlBr₃: Aluminum bromide
- Name of Na₂O: Sodium oxide
Explanation
Understanding the composition and naming of ionic compounds involves recognizing the ions they are made of and applying systematic nomenclature rules. Let’s break down each compound:
1. Co(CH₃COO)₂ (Cobalt(II) acetate):
This compound is ionic, consisting of cobalt cations and acetate anions. The acetate ion (CH₃COO⁻) is a polyatomic ion with a -1 charge. Since there are two acetate ions, the cobalt ion must carry a +2 charge to balance the overall neutrality of the compound. Therefore, the cation is Co²⁺ and the anion is CH₃COO⁻. The compound is named Cobalt(II) acetate, where the Roman numeral (II) indicates the +2 oxidation state of cobalt.
2. BaF₂ (Barium fluoride):
Barium (Ba) is an alkaline earth metal and forms a +2 cation (Ba²⁺). Fluoride (F⁻) is a halide with a -1 charge. Two fluoride ions are needed to balance one barium ion, resulting in the formula BaF₂. The name of this binary ionic compound follows the rule: [metal name] + [nonmetal root + “ide”], hence Barium fluoride.
3. AlBr₃ (Aluminum bromide):
Aluminum (Al) forms a +3 ion (Al³⁺), and bromide (Br⁻) carries a -1 charge. Three bromide ions balance the charge of one aluminum ion. The compound is named Aluminum bromide.
4. Na₂O (Sodium oxide):
Sodium (Na⁺) is a Group 1 metal with a +1 charge. Oxygen typically forms a -2 ion (O²⁻). Two sodium ions are needed to balance one oxide ion, forming Sodium oxide.
These compounds illustrate key principles of ionic bonding and naming, helping students understand chemical composition and nomenclature in inorganic chemistry.
