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.
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]
H+ Concentration Formula
If you want to find out [ H+] than you can use the following formula:
H+ concentration = 10-pH