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if something is and indicator, then it will be able to proove to you wether a substance is acid or alkali.
here are some common lab indicators used to determine the Ph value of some substances.
remember, pH 1-6 is acid
ph7 is neutral
and pH 8-14 is alkali
-Litmus paper is red in a neutral solution, red in an acid and blue in an alkaline solution
-Universal indicator is is green in a neutral solution, red, orange or yellow in an acid and blue or violet in an alkali
-Phenolpthalein is colourless in a neutral solution, colourless in an acid and pink inn an alkal
-Screened methyl orange is orange in a neutral solution, red for pH below 3.6, orange for pH above 3.6 and yellow in an alkaline solution
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