please define ph scale
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In chemistry, pH is a scale used to specify the acidity or basicity of an aqueous solution. Acidic solutions are measured to have lower pH values than basic or alkaline solutions. The pH scale is logarithmic and inversely indicates the concentration of hydrogen ions in the solution
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a scale which is used to measure acidity or basicity of a substance .It has numbered from 1 to14 and numbering means as follows
if>7 the substance is a base
if<7the substance is an acid
=7 the substance is a neutral
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