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universal Indicator : from 350 nm to 700nm in 10 nm increments, why might have caused you to recieve negative absorbance value? Universal indicator [two

universal Indicator

: from 350 nm to 700nm in 10 nm increments, why might have caused you to recieve negative absorbance value?

Universal indicator [two drops] + pH 2/ acidic

Universal indicator [two drops] + pH11/ basic

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