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Chemistry
Freeman
8 June, 16:54
Which solution contains phenolphthalein pink?
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Stanley
8 June, 18:41
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Any liquid with a pH above 8.2.
Phenolphthalein is naturally colorless but turns pink in alkaline solutions. The compound remains colorless throughout the range of acidic pH levels but begins to turn pink at a pH level of 8.2 and continues to a bright magenta at pH 10 and above.
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Tyrell Andrews
8 June, 20:47
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If hydrogen ions (H+, as found in an acid) were added to the pink solution, the equilibrium would switch, and the solution would be colorless. Adding hydroxide ions (OH-, as found in bases) will change the phenolphthalein into its ion and turn the solution pink.
Chemical formula: C20H14O4
Solubility in water: 400 mg/L
GHS precautionary statements: P201, P281, P308+313
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