Question

what is the main reason behind titration and why solution turn pink in acid base titration when o.1 % thymol blue.?

Answer 1

Titration is a analytic methode of measurment. All type of quantitative estimation are done by the titration. The end point, equivalence point, extend of complexation reaction etc can be easily measurable by titration process.

There are various types of titrations with various resons : Acid Base titration. Complexometric titration. Redox titration. Precipitation titration. etc Acid Base titration are use to ditermine the concentration or the of the perticipating acid or base by nutralising acids with bases. The main purpose of the acid base titration is the detection of the equivalence point (ie; at this point equal mole of acids and bases are interact). Complexometric titration measured the end point of a titration of volumetric analysis in which the formation of a colored complex. Redox reaction is occuring on basis of Electrode potential value and oxidation and reduction reaction of the half cells. redox reactions equivalence point measured by redox indicator or by potentiometer. Precipitation titration undergoes with conductance measurment of the reaction mixture .

Thymol Blue is a pH indicator which shows yellow or orange colour at acidic pH and shows blue color at basic pH. The solution never turns pink in addition of Thymol Blue in acid base titration.