Let’s start with the formulas for hydrogen carbonate ion and hydrogen peroxide.
Carbonate is a polyatomic anion with the formula CO32-.
Hydrogen carbonate is another polyatomic anion which has a hydrogen attached to the carbonate ion.
H+ + CO32- → HCO3-
Peroxides are compounds of oxygen where oxygen is present as O22-.
For a compound, the two negative charges need to be balanced with two H+ ions.
2H+ O22- = H2O2
To write Lewis structures of molecules, we will recall the following rules:
Let’s start by calculating the number of valence electrons.
Toothpastes containing sodium hydrogen carbonate (sodium bicarbonate) and hydrogen peroxide are widely used. Write Lewis structures for the hydrogen carbonate ion and hydrogen peroxide molecule, with resonance forms where appropriate.
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