<P> Phenolphthalein is a chemical compound with the formula C H O and is often written as `` HIn '' or `` phph '' in shorthand notation . Phenolphthalein is often used as an indicator in acid -- base titrations . For this application , it turns colorless in acidic solutions and pink in basic solutions . It belongs to class of dyes known as Pthalein dyes . </P>
<P> Phenolphthalein is a chemical compound with the formula C H O and is often written as `` HIn '' or `` phph '' in shorthand notation . Phenolphthalein is often used as an indicator in acid -- base titrations . For this application , it turns colorless in acidic solutions and pink in basic solutions . It belongs to class of dyes known as Pthalein dyes . </P>
what is the colour of phenolphthalein in hcl acid
what is the colour of phenolphthalein in hcl acid
colorless
colorless