>>14232621there's a difference between water and water with molecular hydrogen in it, this extra hydrogen is in addition to the hydrogen in the water
>>14232665molecular hydrogen in water isn't exactly the same as hydrogen gas
>>14232687not at all, they're not hydrogen ions (protons), but molecular hydrogen
the hydrogen will end up as water in combination with oxygen that you breathe in through various reactions, so it will have an overall slight neutralizing effect on pH
>>14233888that's 100% a fact
original answer by Mark Roseman, professor emeritus of biochemistry, on Quora:
>«Citrus fruits are acidic but they do alkalize the body after metabolism. How is such a thing possible?>The juice is a mixture of acids such as citric acid, but also the sodium salts, such as sodium citrate. The mixture is acidic because citric acid has such a low pKa. Its first pKa is 3.1, so that an equal mixture of acid and conjugate base has a pH = 3.1.>When an organic acid such as acetic acid or citric acid is ingested, it does acidify the body for a short time owing to dissociation of the acid to hydrogen ion plus conjugate base. But combustion to CO2 and H2O takes up the proton so that in the end no change of body pH takes place.>On the other hand, ingestion of the sodium or potassium salts of the acids produces sodium hydroxide or potassium hydroxide as an oxidation product. This is sometimes referred to as “alkaline ash.”» 
