How do the measuring strips/test strips for the pH value work
Test strips, the pH indicator paper, can be used to measure the acid value of any solution. The pH test strips can be purchased over the counter in drugstores and pharmacies. Pour the liquid to be tested over a test strip and observe the discoloration of the test strip. There is a characteristic color tone for each pH value on the pH scale, so you can compare the color on the test strip with the color sample in the package insert and read off the pH value.
What is meant by a neutral pH value in humans?
The pH value is a measure of the degree of acidic or basic reaction of a liquid. More precisely, it is the concentration of hydrogen ions contained in the respective solution. The human body consists of more than 2/3 water and of constant metabolic processes in an aqueous environment.
The different organs of the human body have different pH values. The fluid of the pancreas and the intestine have basic pH values of about 8.0. The blood is also clearly basic with a pH value between 7.35 and 7.45.
The muscles and cells of the organs have an average pH of 6.9 and are slightly acidic. Our gastric juice is particularly acidic with fasting values of 1 to 1.5. Neutral pH values are 7 on the pH scale. An example of neutral pH-values in humans is saliva, which is ideally 7 or slightly basic at 7.1.
