How many times more acidic is stomach acid than a soda drink?
Stomach Acid is Hydrochloric Acid mixed with other substances.
The pH of hydrochloric acid is pH = 1.
So it is a lot more acidic than a soda drink.
Heaven forbid, but when you vomit, that horrible burning sensation is the hydrochloric acid from your stomach, refluxing into your throat/mouth.