ph scale..... values.....
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A measure of acidity or alkalinity of water soluble substances (pH stands for 'potential of Hydrogen'). A pH value is a number from 1 to 14, with 7 as the middle (neutral) point. Values below 7 indicate acidity which increases as the number decreases, 1 being the most acidic.Values above 7 indicate alkalinity which increases as number increases, 14 being most alkaline.
pH Values of some Common Substances
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PH-VALUES-
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Gastric acid = 1.0
Lemon juice=2.3
Vinegar=2.4
Milk=6.4
Urine=5.5
Saliva=6.2
Pure water=7.0
Bile=7.6
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