Gastric acid
The highest concentration that gastric acid reaches in the stomach is 160 mM in the canaliculi. This is about 3 million times that of arterial blood, but almost exactly isotonic with other bodily fluids. The lowest pH of the secreted acid is 0.8, but the acid is diluted in the stomach lumen to a pH between 1 and 3.
Wooden reed care
Normally, saliva is slightly acidic and has a pH less than 7, but it can vary between 6 and 8. The pH inside the mouth depends on the salival flow rate because the higher the flow rate of saliva the more salival bicarbonates are present. Bicarbonates in the saliva raise the pH inside the mouth. When there is no or low saliva flow, also known as xerostomia, the pH inside the mouth is around 6. When salival flow rate is high the pH is about 8. During a concert, if a musician is suffering from xerostomia, also known as dry mouth, the saliva pH is expected to be acidic.