I would like to answer your question but Im a bit confused...if you mean molecular formula well for carbon dioxide you are right it is CO2, however pH is a measure of acidity and simple measures the concentration of hydrogen ions (found in acids) thereby showing the measure of acidity fot he solution.
Carbon Dioxide is acidic so it will have a high pH (pH5 for example)
It would be useful If you rephrased your question but otherwise I hope I have answered your query.
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