Why do we write CH3COO for acetate instead of C2H3O2?
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because it depends on valence of electrons in an atom
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The first one is the molecular (actually ionic) formula, and all it reveals about the ion is the number of each type of atom and the overall charge.
The second one is the linear formula, which contains all the information that the ionic formula contains, plus it shows the structure. You have to know some conventions of linear formula representations to decipher it, but any competent chemist would be able to visualize the connectivity (which atoms are connected to which others) from this linear formula.
Acetate is such a common organic ion that our competent chemist would recognize it from either formula. But as the structure gets larger and less ubiquitous, that becomes less true. In any case, both are valid for acetate, but the non-structural representation would be unacceptable for more complex ions.
The second one is the linear formula, which contains all the information that the ionic formula contains, plus it shows the structure. You have to know some conventions of linear formula representations to decipher it, but any competent chemist would be able to visualize the connectivity (which atoms are connected to which others) from this linear formula.
Acetate is such a common organic ion that our competent chemist would recognize it from either formula. But as the structure gets larger and less ubiquitous, that becomes less true. In any case, both are valid for acetate, but the non-structural representation would be unacceptable for more complex ions.
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