Preface
Finding the value for pH is essential in determining an importantcharacteristic of a solution.
So, pH is just a unit to represent one characteristic of a solution, just as the meter is a unit of length. So, what kind of characteristic is represented by pH?
Acidity or Alkalinity
Lemon juice tastes sour. Soapy water is slimy and tastes somewhat bitter. If you dip blue litmus paper into lemon juice, it turns red. If you dip it into soapy water, it turns blue. Because lemon juice is acidic, it makes blue litmus paper turn red.
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