The titration curve of weak acid vs. strong base with phenolphthalein as indictor) is shown below. The K_phenolphthalein =4 × 10^-10. Given: log…

The titration curve of weak acid vs. strong base with phenolphthalein as indictor) is shown below. The $\displaystyle \mathrm{K}_{\text {phenolphthalein }}=4 \times 10^{-10}$.Given: $\displaystyle \log 2=0.3$ The number of following statement/s which is/are correct about phenolphthalein is $\displaystyle \_\_\_\_$ A. It can be used as an indicator for the titration of weak acid with weak base. B. It begins to change colour at $\displaystyle \mathrm{pH}=8.4$ C. It is a weak organic base D. It is colourless in acidic medium