As in calcium carbonate? hmmm.... Bicarb makes carbonic acid to create CO2, so I think you are right.
Seems like the bottle should have a ph measurement, or you could test it with aquarium strips.
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I get the logic of that, however, soda would be naturally alkaline also, yet it acidifies the body, while things like fresh lemon juice is and kambucha are acidic yet they promote body alkalinity. I don't know why. I should probably just read some books on it. I'm concerned since body acidity can lead to things like cancer.