define PH.what is olfactory indicators.
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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.
A substance whose smell varies depending on whether it is mixed with an acidic or basic solution is known as an 'Olfactory indicator'. Such substances can be used in the laboratory to test whether a solution is a base or an acid, and this process is called olfactory Titration.
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