What is the pH scale

The pH values of different aqueous (water) solutions can be arranged in a pH scale. It is a 14 point scale used to measure the acidity or basicity of a solution. A value of 7 is neutral. A pH less than 7 is acidic and a pH greater than 7 is basic.

The pH scale is logarithmic. This means each whole pH value below 7 is ten times more acidic than the next higher value. The same applies for pH values above 7, each of which is ten times more basic than the next lower whole value.

To get a better feeling about different pH values it is worth remembering a few:

pH balance

pH is one of the most important parameters describing solution properties. It is so important as it can drastically change equilibrium state and speed of many reactions. Precise control of pH is vital for good yield in many processes and to avoid damage to people, materials, equipment and environment.


The pH level of your body is critical for your health

Your internal pH balance is very important and your body continually strives to balance pH. When this balance is compromised many problems can occur. The reason is there are countless chemical reactions necessary for life that can only occur within a very specific pH range.

Your blood stays in a very narrow pH range right around 7.35 - 7.45. Below or above this range can signal potentially serious and dangerous symptoms or states of disease. If the pH value of the blood deviates too much from the ideal pH level, cells stop functioning and death occurs.




Favorite pages:


acids and bases
What is an acid? What is a base? If you want to know, read here!

calculating ph
Do you know what pH stand for? If not, click here!

electrode design
The pH electrode consists of the following parts:
. . read here!
offset error
Real-world pH electrodes are not ideal,
read why.

definition of ph
What is the definition of pH? See the answer. . .

nonglass ph electrode
Is it not possible to use a glass electrode for your application? Use a non-glass pH electrode.

ph measurement
Learn how the temperature affects your pH measurement.