Topic: Colors of phenolthalein changing back when titrating a weak acid and weak base?? (Read 3297 times)

appleseed · « **on:** September 30, 2009, 04:09:06 AM »

Suppose phenolthalein was added to NaOH and was titrated with a sample of CH3COOH.
Is it true that when titrating a weak acid and a weak base, the color of the phenolthalein indicator may change to clear ( indicating that the solution has become acidic and the titration is finished) and after a while the indicator may change BACK to pink again??

True

False??
If so can you explain why??

Thankyou!!!

kimyacı · « **Reply #1 on:** October 01, 2009, 04:13:50 PM »

I’m not sure ıt’s like so but I saw this occurrence in lab.

Topic: Colors of phenolthalein changing back when titrating a weak acid and weak base?? (Read 3297 times)

appleseed

Colors of phenolthalein changing back when titrating a weak acid and weak base??

kimyacı

Re: Colors of phenolthalein changing back when titrating a weak acid and weak base??

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