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Q.

The titration curve of weak acid vs. strong base with phenolphthalein as indictor) is shown below. The Kphenolphthalein=4×10−10. Given log2=0.3

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The number of following statement/s which is/are correct about phenolphthalein is …… 
A) It can be used as an indictor 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 

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answer is 2.

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Detailed Solution

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Ka=4×10−10pKa=−log⁡4×10−10=10−log⁡4=9.4pH=pKa±1 B, D are correct statement 

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