It is always good to have an assay where something happens. For example red pH paper...

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Biology

It is always good to have an assay where something happens. Forexample red pH paper that just remains red in acid isunsatisfactory. How can you make Ph paper which is green and thenturns red when put in acid solution? how can you make red pHpaper?

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pH papers are small strips of papers coated with a chemical substances they undergo a reaction when comes in contact with the liquid to be tested These papers usually come in two colors green and red Red paper turns green when it comes in contact with a base similarly green paper turns red when    See Answer
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