Question

Why is phenolphthalein the best indicator?

Answer 1

They have sharp and bitter test and they change the colour of indicator

Answer 2

To be a reasonable indicaor in corrosive base titrations, the marker must change shading when the pH change of the reactants is generally quick. Phenolphthalein changes shading at a pH higher than 7. A titration bend can be utilized to outline this.

Phenolphthalein isn't appropriate for ALL corrosive base titrations.

While titrating a solid corrosive with a solid base, the comparability point is at a pH of 7. Notwithstanding, the volume of base added to make a pH of 7 is nearly equivalent to the volume of base you to influence phenolphthalein to go pink. So it is appropriate for these sorts.

When utilizing a powerless corrosive and a solid base, the steepest piece of the titration bend happens at a pH somewhat over 7, so phenolphthalein is additionally reasonable for this sort.

At the point when a feeble base and a solid corrosive are utilized, the most fast pH changes and the steepest piece of a titration bend happen at a pH under 7. Phenolphthalien isn't as reasonable for this titration.