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What is pH scale ?


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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