EVERYDAY SCIENCE

Detailed explanation-1: -An example of a weak acid indicator is phenolphthalein, which is colorless as a weak acid but dissociates in water to form a magenta or red-purple anion.

Detailed explanation-2: -Note: China rose indicator changes the acidic solution to magenta (dark pink). It turns the basic solution to dark green colour and no colour change in neutral solutions. Let us now test the below solutions for their acidity and basicity by adding the prepared solution to it. And observe the changes in their colour.

Detailed explanation-3: -Which indicator is used in acid-base titration? Using a phenolphthalein indicator, a strong acid-strong base titration is performed. Phenolphthalein is selected because it changes colour between 8.3-10 in a pH range. In basic solutions, it will appear pink, and clear in acidic solutions.

Detailed explanation-4: -In Acidic solution phenolphthalein is colourless but in basic it gives pink colour .

Detailed explanation-5: -phenolphthalein, (C20H14O4), an organic compound of the phthalein family that is widely employed as an acid-base indicator. As an indicator of a solution’s pH, phenolphthalein is colourless below pH 8.5 and attains a pink to deep red hue above pH 9.0.