what happen if we add phenolphthalein to salt water
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Phenolphthalein is an indicator of acids (colorless) and bases (pink). Sodium hydroxide is a base, and it was in the pitcher at the beginning, so when added to the phenolphthalein in beakers 2 and 4, it turned pink (top half of the graphic). The equilibrium shifts right, HIn decreases, and In- increases.
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If phenolphthalein is added to water it may turn into pink colour indicating that water contains some impurities but if water is distilled one it will not show any change in colour as it's pH is neutral.
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