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Draw a neat and labelled diagram of pH scale.

Answer
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Hint : We all are familiar with the term pH and pH scale. pH scale is a scale of acidity and basicity which tells about the acidic and alkaline behaviour of substance .

Complete answer:
> On the pH scale the value ranges from 0 to 14. So the more acidic solution will have lower pH and neutral solutions will have pH equal to 7 and more than 7 acidic nature decreases and alkaline nature increases .Since pH is defined as the negative of the base 10 logarithm of the concentration of hydrogen ion ; pH= log10[H+]means pH is a measure of the concentration of H+ ion in the solution.
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> The pH value can be less than zero which indicates very strong acid and pH value greater than 14 for a very strong base. A solution where are more H+ ions than OH then the solution is acidic and in neutral solution there are equal number of H+ ions and OH ions. pH scale has a variety of applications in agriculture, research development, water treatment, environmental monitoring, in quantitative measurement and industrial processing. pH values are affected by temperature so pH applications need to form some temperature compensation to insure standardizes of pH values. We use pH indicators to check the nature of the solution but it does not give precise value of pH because it just changes colour while pH measurement meters used nowadays give an exact value of pH.

Note : Hence pH scale gives information about the acidity and alkalinity of any substance and it ranges from 0 to 14 . pH scale is also called the pH-acid-base scale. Solutions which are neither acidic nor basic are 7. So pH is a measure of the hydrogen ion activity in aqueous solution.