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(a) PH scale
(b)PH scale is used to specify the acidity or basicity of an aqueous solution . The range goes from 0to14 , with 7 being neutral . PHs of less than 7 indicate acidity, whereas a PH of greater than 7 being indicates a base. PH is a measure of the relative amount of free hydrogen and hydroxyl ions in the water.
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(1) PH paper or scale
(2) In PH scale their acidity and base both are present less than 7 is base and more than 7 is acidity. PH paper also show the color during chemical reaction.
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