why the pink colour of the phenolphthalein fades after the end-point?

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amy998
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#1
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#1
In an acid-base titration, why the pink colour of the phenolphthalein fades after the end-point of the titration has been reached?
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Borek
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#2
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It may depend on many tings. What are you titrating?

In the most common, simple titrations, excess of base added is pretty small and can be easily neutralized by an acid oxide that is always universally present in the atmosphere.
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amy998
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#3
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(Original post by Borek)
It may depend on many tings. What are you titrating?

In the most common, simple titrations, excess of base added is pretty small and can be easily neutralized by an acid oxide that is always universally present in the atmosphere.
I am titrating propanol, ethanoic acid with sodium hydorxide. The question says ignore the acidic gas from the atmosphere

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Borek
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#4
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#4
Just a guess: are you trying to determine equilibrium constant for the esterification reaction?

If so, think what can happen to your ester in a slightly basic, diluted solution after the titration ended.
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amy998
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#5
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(Original post by Borek)
Just a guess: are you trying to determine equilibrium constant for the esterification reaction?

If so, think what can happen to your ester in a slightly basic, diluted solution after the titration ended.
Yes but I was wondering is there anything to do with ester in the titration?
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Borek
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#6
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#6
Think: what can happen to your ester in a slightly basic, diluted solution.
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