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PH scale strips are nothing but litmus paper. they are used to know the nature of given chemical( acid/ base).
they turn blue when the substance is acidic and red when the chemical is basic.
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Ph scale strips are used to measure the acidity or alkalinity of a solution.
they have ratings between 1 to 14,less than  7 indicates an acidic solution
greater than 7 indicates an alkaline solution.
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