formula for cobalt (II) chlorite?
The correct answer and explanation is :
The correct formula for cobalt(II) chlorite is Co(ClO₂)₂.
Explanation:
- Understanding Cobalt(II):
- The Roman numeral (II) in cobalt(II) indicates that cobalt has a +2 oxidation state, meaning its ionic charge is +2.
- The symbol for cobalt is Co.
- Understanding the Chlorite Ion:
- Chlorite is a polyatomic ion with the formula ClO₂⁻.
- It has a -1 charge.
- Balancing Charges:
- Since Co²⁺ has a +2 charge and ClO₂⁻ has a -1 charge, two chlorite (ClO₂⁻) ions are needed to balance the charge.
- This results in the formula Co(ClO₂)₂.
Why Parentheses?
- The parentheses around ClO₂ indicate that two chlorite ions are present in the compound.
- Without parentheses, it might be misinterpreted as CoClO₂₂, which is incorrect.
Verification of Charge Balance:
- Cobalt(II) ion charge: +2
- Two chlorite ions charge: 2 × (-1) = -2
- Total charge = 0, meaning the compound is electrically neutral.
Common Mistakes to Avoid:
- Confusing Chlorite with Other Chlorine Oxyanions:
- Chlorate (ClO₃⁻) and Perchlorate (ClO₄⁻) are different from Chlorite (ClO₂⁻).
- Be careful not to mix up chlorite with hypochlorite (ClO⁻) either.
- Incorrectly Writing the Formula as CoClO₂:
- This would imply only one chlorite ion is present, which does not balance the cobalt(II) charge.
Applications of Cobalt(II) Chlorite:
While cobalt(II) chlorite is not very common, cobalt compounds are used in batteries, pigments, and catalysts. Chlorite compounds, in general, are used in bleaching and disinfecting applications.
Thus, the correct formula for cobalt(II) chlorite is Co(ClO₂)₂.