why are litmus paper and phenolphthalein
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these are Acid Base Indicators
if blue litmus is kept in Base the litmus turns into red
if a red litmus is kept in acid it turns into blue
in acid
phenolphthalein turns colour less
in base it turns into pink
if blue litmus is kept in Base the litmus turns into red
if a red litmus is kept in acid it turns into blue
in acid
phenolphthalein turns colour less
in base it turns into pink
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