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Formal Charge Problems (3)

Formal Charge Problems (3) - Carbonate (CO3)

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Introduction

This video explains how to calculate the formal charge of each atom in the carbonate ion (CO32-). The process involves determining the number of bonding and non-bonding electrons for each atom and using the formal charge formula.

Main Points/Arguments

- Formula: Formal Charge = (Valence electrons in neutral atom) - (1/2 number of bonding electrons) - (Number of non-bonding electrons)

- This formula helps assign the charge to specific atoms within a molecule.

- Left Oxygen Atom:

    - **Bonding Electrons:** 2 (one bond).
    - **Non-Bonding Electrons:** 6 (three lone pairs).
    - **Calculation:** 6 (valence electrons) - (1/2 * 2) - 6 = -1.
    - **Conclusion:** Oxygen has a formal charge of -1.

- Carbon Atom:

    - **Bonding Electrons:** 8 (four bonds).
    - **Non-Bonding Electrons:** 0.
    - **Calculation:** 4 (valence electrons) - (1/2 * 8) - 0 = 0.
    - **Conclusion:** Carbon is neutral with a formal charge of 0.

- Right Oxygen Atom:

    - **Bonding Electrons:** 2 (one bond).
    - **Non-Bonding Electrons:** 6 (three lone pairs).
    - **Calculation:** 6 (valence electrons) - (1/2 * 2) - 6 = -1.
    - **Conclusion:** Oxygen has a formal charge of -1.

- Top Oxygen Atom:

    - **Bonding Electrons:** 4 (two bonds).
    - **Non-Bonding Electrons:** 4 (two lone pairs).
    - **Calculation:** 6 (valence electrons) - (1/2 * 4) - 4 = 0.
    - **Conclusion:** Oxygen is neutral with a formal charge of 0.

Examples or Evidence

- The carbonate ion consists of one carbon and three oxygen atoms.

- Two oxygen atoms have a formal charge of -1, while the carbon and one oxygen atom are neutral.

- The overall charge of the carbonate ion is -2, making it an anion.

Additional Insights or Context

- The carbonate ion (CO32-) is commonly found in compounds such as sodium carbonate and potassium carbonate.

- It has a significant role in various chemical and biological processes.

Conclusion

The video demonstrates the application of the formal charge formula to the carbonate ion, highlighting how to calculate and assign charges to specific atoms. Understanding formal charges is essential for analyzing molecular structure and reactivity.

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