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Phenolphthalein is really a popular pH indicator that changes color according to the pH of a solution. It is often found in acid-base titrations to look for the endpoint of the reaction.
In acidic solutions, phenolphthalein remains colorless, during basic solutions it turns pink or purple. The color change occurs when the phenolphthalein molecule is deprotonated by hydroxide ions, causing it to change from its acidic, colorless form to its basic, pink or purple form.
Phenolphthalein is a weak acid with a pKa of around 9. It really is soluble in alcohol and ether, but only slightly soluble in water. read more is often used in titration experiments due to its color change properties, but it is important to notice that phenolphthalein isn't suitable for use in strongly acidic or basic solutions, as its pH range is bound to around 8-10.
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