Gastric acid contains hydrochloric acid , around 0.5 % , or 5000 parts per million as high as 0.1 N .
It has a pH of 1.5 to 3.5 and is composed of hydrochloric acid ( HCl ) ( around 0.5 % , or 5000 parts per million ) as high as 0.1 N ,   ? show=sb & action=explode & id=31 & sid=42 and large quantities of potassium chloride ( KCl ) and sodium chloride ( NaCl ) .
Gastric acid