Question: How do carbonated water, magnesium, and potassium affect pH?
If you drink carbonated water, the CO2 is going to give up hydrogen ions to become carbonic acid, which is going to give up hydrogen ions to become bicarbonate. So making bicarbonate from CO2 is acidic taking bicarbonate is alkaline. So the thing you have to keep in mind here is that the reason bicarbonate is alkaline is because it makes CO2.
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DISCLAIMER: I have a PhD in Nutritional Sciences and my expertise is in performing and evaluating nutritional research. I am not a medical doctor and nothing herein is medical advice.