What is pH scale ?
A scale for measuring hydrogen ion concentration in a
solution or it is used to measure acidity or basicity of a solution is called pH scale . The “ p ” in pH
stands for ‘ Potenz’. The word Potenz is derived from German which means Power.
pH value of a solution is simply a number which indicates the acidic or basic
nature of a solution.
The
range of pH scale is 0 to 14 . The pH of
neutral solution is 7. Values less than 7 on the pH scale represent an acidic
solution . As the pH value increases from 7 to 14 , it represents a decrease in
H3O+ ion concentration or an increase in OH- ion
concentration in the solution. pH value of a solution above ‘7’represents a
basic solution.
The strength of an acid or base depends on the concentration
of H3O+ ions or OH- ions produced in solution. Acids that
give more H3O+ ions are said to be strong acids that give fewer H3O+
ions are said to be weak acid .
Uses of pH scale :-
pH scale is used in our daily life . It is important in
cooking, water purification , agriculture, medicine, chemistry, biology and
other sciences.
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