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Solution


Q.

The titration curve of weak acid vs. strong base (with phenolphthalein as indicator) is shown below. The Kphenolphthalein=4×10-10.

Given: log 2=0.3

The number of following statement/s which is/are correct about phenolphthalein is __________.                [2023]

A. It can be used as an indicator for the titration of weak acid with weak base.

B. It begins to change colour at pH = 8.4

C. It is a weak organic base

D. It is colourless in acidic medium              

Ans.

(2)

1.  Working pH range is 8 to 10

2.  It is colourless in acidic medium and pink in basic medium.

3.  It is an acidic indicator.