What is a PH value
Everyday life human soil chemistry
pH value in A.everyday
Every aquarium enthusiast needs to know the pH value at which the fish feel comfortable. Depending on the type of fish, it requires a very specific pH value that must be adhered to. The pH value indicates how acidic or alkaline a solution is. The concentration can easily be measured with a pH test paper. The pH value can be read off on a comparison scale:
The starting point of the scale is pure water, which at 25 ° C always has pH = 7, it reacts neutrally. Values below indicate acids, values above caustic solutions or alkalis. As the acid concentration increases, the pH value of a solution decreases and it becomes more acidic. As the alkali concentration increases, the pH value of a solution rises and it becomes more alkaline.
pH in the human body
The pH value plays an important role in the human body. in the blood the pH value is directly related to the oxygen absorption capacity. The hemoglobin in the red blood cells can bind more oxygen, the higher the pH value. The blood is very slightly alkaline (= basic): The pH value in the blood in healthy people is between pH = 7.35 and pH = 7.45.
The Saliva is neutral to very slightly basic with pH = 7.0 to pH = 7.1. The enzyme amylase working there splits the starch into smaller components. The Gastric juice is very angry. The respective enzymes for digestion only work at certain pH values. The pepsin in the stomach needs about pH = 2 so that it can break down the proteins. The enzymes in the Small intestine but only work in the neutral to slightly basic range. The Pancreas from the pancreas contains sodium hydrogen carbonate, it has a pH value of 8.0 and neutralizes the acidic digestive pulp from the stomach. It also supplies other digestive enzymes for the small intestine, as well as hormones. The bile with pH = 7.1 from the liver is temporarily stored in the gall bladder. It is released when food is consumed and is used for fat digestion Duodenum, the first section in the small intestine. There the optimal pH value is between pH = 6 and pH = 8. The Colon likes it more acidic again with pH = 5.5 to pH = 6.5.
The digestive system works with several buffer systems that are used to remove excess acid from the body. Because of this, the urine (or urine) from the kidney in contrast to the intestines acidic. The acidic components in the urine are uric acid, oxalic acid or citric acid. It also contains urea, creatinine, phosphates, and other salts like sodium chloride. The normal pH value in the urine is between pH = 4.8 and pH = 7.6. It fluctuates during the day. In the morning, the urine is more acidic as a result of acid degradation overnight. If this is not the case, then there is a disease in which the acid cannot be broken down. The pH level in the urine is also dependent on the diet: Meat and dairy products result in a lower pH level in the urine, while vegetables and fruits produce a higher pH level. They are called "basic food".
In the cells and in the Musculature the pH value is rather low, pH = 6.9, because the combustion in the cells produces carbon dioxide and carbonic acid. Exercise and sport lead to a faster deacidification of the body.
|liquid||PH value||Digestive functions|
|saliva||pH = 7.0 to 7.1||Starch splitting and liquid supplier|
|Gastric juice||pH = 1.2 to 3.0||Protein cleavage|
|Pancreas from the pancreas||pH = 8.0 to 8.4||Enzyme supplier for the digestion of carbohydrates, fats and proteins in the small intestine, neutralization of gastric acid, hormone production|
|Bile from the liver||pH = 7.1||Enzyme supplier for fat digestion in the duodenum|
|Small intestinal juice||pH = 6.0 to 8.0||digestion|
|Colon Juice||pH = 5.5 to 6.5||Absorption of nutrients and thickening of the residues (fiber)|
|Urine from the kidney||pH = 4.8 to 7.6||Deacidification, elimination of toxins and metabolic products|
|Muscles and cells||pH = 6.9||Energy generation|
|connective tissue||pH = 7.1 to 7.3||Support function, water storage, defense against disease|
|Skin surface||pH = 5.5||Acid mantle|
The human skin surface is relatively acidic with pH = 5.5. This natural Acid mantle the skin inhibits the growth of bacteria and prevents them from entering. Normal soap is in the alkaline range with pH = 9. When washing with soap, the acid on the skin is therefore neutralized. The skin is then exposed to a higher risk of infection. After each wash with soap, it takes two to three hours for the natural protective acid mantle to be restored. For this reason, soap should only be used on very dirty hands or, in general, a “pH-neutral” soap should be used.
Recommendation: use hand washing detergent with pH = 5.5.
pH value in B.oden
pH in chemistry
The pH value is a number that indicates how high the concentration of hydronium ions [H3O+] is in an aqueous solution. It is given by the negative decadic logarithm of the H3O+-Ion concentration expressed:
pH = - log [H.3O+]
Example: There are always 10 in pure water−7mol / l of H3O+Ions (and also at OH−Ions). This results from the ionic product of the water. So water itself always acts to a small extent as a Brönsted acid and as a Brönsted base. This property is known as autoprotolysis of the water. Now the concentration of the H3O+-Ions in the water are inserted into the equation for calculating the pH value:
pH = - log [10th−7] = −(−7) = 7
This results in a pH value of 7 for water. The pOH value indicates the concentration of OH−Ions in the water. A pH value and a pOH value can therefore always be calculated for all acids and alkalis. The sum of the two values always results in 14:
pH + pOH = 14
The table below shows the relationship between pH and pOH as a function of the concentration present. Between two pH values, for example between pH = 14 and pH = 15, the concentration of the ions decreases or increases by a factor of ten. In alkaline solutions, the concentration of hydroxide ions exceeds that of hydronium ions. In acidic solutions it is the other way round.
Create an individual book: Basic text pH value
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