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A figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline.
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pH means Potential of Hydrogen Or Power of Hydrogen ...
Definition-----It is the  concentration of H+ions Mole per litre.
In the pH scale 7 is neutral and Below 7 is identified as Acidic and Greater is identified as Basis..........
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