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Negative logarithm of hydrogen ion is called pH .-log(h+).
it helps in acidity value of the hcl in stomach.,citric acid

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PH stands for Potential of Hydrogen. pH value is that scale which determines whether the solution is acidic or basic.

Solution less than 7 is Acidic and greater than 7 is basic in nature.

It's importance in our daily life are = 
1. Our body works with 7 to 7.8 of pH.
2. Less than 5.5 pH value of our mouth causes Tooth Decay.
3.Blood has pH value between 7.35 to 7.45
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mark my best
than q 4 your detailed information
ur welcom
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