If several drops of this indicator are placed in a 25.0 ml sample of 0.100 M HCl, what colour will the solution appear? If 0.100 M NaOH is slowly added to the HCl sampl Phenolphthalein is an indicator that changes colour to pink/purple...
pH 7 (e.g. as determined with a pH meter), we find the phenolphthalein indicator is still colourless, and the pink colour only appears when the pH reaches 8.2. Therefore, we have a problem: the indicator has not detected neutrality, since it changes colour at too high a value of pH....
Phenolphthalein has a pKa of 9.7 and is colorless in its acid form and pink in its basic form. for ph 4.7Predict the color of a phenolphthalein solution.Acid base indications usually show a colour change: a. at exactly the pKin of the indicator ...
Step-by-Step Solution:1. Understanding Phenolphthalein: - Phenolphthalein is an acid-base indicator that changes color based on the pH of the solution. It is colorless in acidic solutions and turns pink in