When phenolphthalein is used as the indicator in a titration of an HCl solution with a solution ofNaOH, the indicator undergoes a colour change from colourless to poink at the end point of the tiration. This colour change occurs abruptly because ...
(i) nature of solution where phenolphthalein is pink and colourless. (ii) nature of the comonents produced on hydrolysis of salts (iii) relation between the components produced and the colour change of indicator