Why is phenolphthalein used as an indicator in the titration?

Phenolphthalein is used as an indicator in acid-base titration as it indicates the change in pH by changing its colour [actually, going from colourless (in acidic solution) to pink colour(in basic solution)].

Why is phenolphthalein used as an indicator instead of methyl orange?

If you use phenolphthalein, you would titrate until it just becomes colourless (at pH 8.3) because that is as close as you can get to the equivalence point. On the other hand, using methyl orange, you would titrate until there is the very first trace of orange in the solution….

Why is phenolphthalein a better indicator for titration than universal indicator?

Now if you want to titrate to a certain pH-Value, it is easier to have an indicator like phenolphtalein that changes from colorless to a color at a certain point (phenolphtalein being colorless from 0 to 8 and red for <0). So you can titrate more accuratly to a certain pH-Value with specialized indicators.

Why is an indicator used in titration?

In a titration, you determine an unknown concentration of a sample by adding a second reactant of known concentration. In many titrations, you use a chemical called an indicator, which lets you know when the titration finishes.

What is phenolphthalein used for?

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.

Why dont we use a universal indicator for titration?

The universal indicator is not used in titration because they have different pH ranges. It becomes difficult to determine the exact pH of the solution. Therefore, universal indicator is not used in titration.

Why phenolphthalein is Colourless in acid?

Phenolphthalein is a weak acid and is colorless in solution although its ion is pink. 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.

Is phenolphthalein is a natural indicator?

Phenolphthalein is not a natural indicator it is a man-made or a synthetic indicator which is colourless in acidic medium but gives pink colour in basic medium.

What is the nature of phenolphthalein indicator?

– Phenolphthalein (HIn) is weakly acidic in nature and in aqueous solution, it dissociates into H+ and In− ions.

Why is phenolphthalein used as an indicator in acid base titration?

Phenolphthalein is used as an indicator in acid-base titration as it indicates the change in pH by changing its colour [actually, going from colourless (in acidic solution) to pink colour(in basic solution)].

What is the colour of phenolphthalein at pH 9?

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 marking the attainment of equivalence point of titration.

Why is the indicator pink in titration?

The pink colour of the solution is due to the concentration of ions in the solution. Under acidic conditions, the concentration of in the solution is very low and concentration of is high, hence it is colourless. Subsequently, question is, what is the role of indicator in titration?

What color does methyl orange change to in titration?

Methyl orange shows red color in acidic medium and yellow color in basic medium. Because it changes color at the pH of a mid strength acid, it is usually used in titration for acids. Also Know, what indicator can be used instead of phenolphthalein?