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Definition of pH scale in Chemistry

Acids and bases CBSE CHEMISTRY IB DIPLOMA CHEMISTRY IGCSE CHEMISTRY MYP 3 MYP 4 MYP 5 MYP CHEMISTRY

Definition of pH scale in Chemistry

The pH scale in Chemistry represent values with specific color.

The pH is the degree of acidity or basicity of a chemical substance in aqueous systems.

pH scale
pH scale


In simple terms pH is the power of hydrogen ion or hydronium ion concentration.

It can be calculated by :

The pH scale by Equation

pH = – log10[H+] or 

pH = – log10[H3O+

[ ] square bracket represents the concentration in mol/dm3

Example: If a sample of an acid is found to have[ H+]=1X10-4

Than pH = – log10[1X10-4]

pH = -[-4 log 10]

pH= 4

H+ Concentration Formula

If you want to find out [ H+] than you can use the following formula:

H+ concentration = 10-pH

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