Why is phenolphthalein used in weak acid?

Because it indicates the pH of the solution, it is colourless below 8.5 pH and is able to attain a pink to deep red colour above 9.0 pH. Phenolphthalein is a weak acid and it dissociates in water to give pink anions. Hence, we can say that phenolphthalein is a weak acid. Therefore, (B) is the correct answer.

What is the purpose of the phenolphthalein in an acid base titration?

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 the class of dyes known as phthalein dyes.

Is phenolphthalein a good indicator for strong acid strong base titration?

For example, in the titration of a strong acid with a strong base, the pH quickly changes from 3 to 11. The indicator phenolphthalein, whose range spans from pH 8 to 10, therefore makes a good choice for this type of titration.

Which indicator is used for the titration of weak acid and strong base?

In the titration of strong acid and weak base, the indicator used is Methyl Orange.

Is phenolphthalein a weak acid?

Phenolphthalein is a colourless, weak acid which dissociates in water forming pink anions. The pH of the solution at its turning point is called the pKln and is the pH at which half of the indicator is in its acid form and the other half in the form of its conjugate base.

What was the purpose of the phenolphthalein indicator in this experiment?

In this experiment, a phenolphthalein color indicator will be used. Phenolphthalein is colorless in acidic solutions and pink in basic solutions. Phenolphthalein is also used in forensic crime scene analysis to detect the presence of blood, Kastle-Meyer test.

Why is phenolphthalein used for strong acid strong base?

A strong acid- strong base titration is performed using a phenolphthalein indicator. Phenolphtalein is chosen because it changes color in a pH range between 8.3 – 10. It will appear pink in basic solutions and clear in acidic solutions. Neutralization is the basis of titration.