Hello everyone, I believe many netizens don’t understand the pH range, including the pH grading standard, but it doesn’t matter. Next, I will share with you about the pH value. You can pay attention to the collection of some knowledge points about the range and ph value grading standards, so as not to find it next time. Let’s get started!
Table of contents
- What is the neutral ph value
- What is the normal pH value of gastric acid
- Ph value grading standard
- What is the ph value standard of mineral water
- What is the ph value standard of raw water
- What is the unit of ph value
1. What is the pH value of neutral?
A pH value of 7 is neutral, a pH value of less than 7 is acidic, and a pH value of greater than 7 is alkaline. The pH value of the human body is different. The normal values of body fluids in different parts of the body are different. For example, the normal pH value of gastric juice is 1~3, the normal pH value of urine is 5~6, the normal pH value of cerebrospinal fluid is 7.31~7.34, and the normal pH value of pancreatic juice produced by the pancreas is 7.8 -8..
2. What is the normal pH value of gastric acid
The pH value of gastric acid It is normal to be between 0.8-1.9 and is affected by some factors. When the body ingests food, the gastric glands begin to secrete gastric acid. The main function of gastric acid is to help digest food, kill bacteria in food, and maintain the health of the digestive system. After the stomach contents are emptied, stomach acid will be slightly higher due to the lack of neutralization by food. The pH of stomach acid on an empty stomach is about 7.0-7.2. After drinking water or proper consumption of food, the body neutralizes gastric acid, which decreases due to the synthesis of food.
3. pH value grading standards
1. Opinions and suggestions: ph=7 is neutral, ph less than 7 is acidic, ph greater than 7 is alkaline, the range of ph is 0~14, the smaller the value, the stronger the acidity, the larger the value, the stronger the alkalinity
2. Opinions and suggestions: ph=7 is neutral, ph less than 7 is acidic, ph greater than 7 is alkaline, the range of ph is 0~14, the smaller the value, the stronger the acidity, the larger the value, the stronger the alkalinity
4. What is the standard pH value of mineral water
Mineral water The standard range of pH value is between 5.0-7.0, while the normal pH value of human body fluids is between 7.35-7.45.
Mineral water comes from deep underground. Unpolluted underground mineral water that emerges naturally or is artificially exposed contains a certain amount of mineral salts, trace elements or carbon dioxide gas. Under normal circumstances, its chemical composition, flow rate, water temperature, etc. are relatively stable. .
5. pH value standard of raw water
Factory tap water ph The value is 6.5, tap water is less than 7, because the water plant uses chlorine for disinfection, which will generate hydrogen chloride, and distilled water will be slightly less than 7 due to dissolved carbon dioxide in the air.
Although water is neutral (pH=7.0), most water in nature will dissolve into a certain concentration of carbon dioxide. In addition, chlorine is added to tap water for disinfection. Chlorine in the water will produce a small amount of hypochlorous acid, making the water appear Weakly acidic. my country\’s national standards stipulate that the pH value of tap water is within the range of 6.5 to 8.5.
6. What is the unit of ph value?
1. The ph unit describes the acidity and alkalinity of an aqueous solution.
2. The pH value is a method of expressing the pH of a solution, that is, the hydrogen ion concentration index refers to the ratio of the total number of hydrogen ions in the solution to the total amount of substances. Its value is commonly known as the \”pH value\”. Numerical value, that is, the negative value of the common logarithm of the hydrogen ion concentration contained in it.
This ends the content about the pH value range. I hope it is helpful to everyone.
