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Topic: About complexometric titration  (Read 3592 times)

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Offline key_i

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About complexometric titration
« on: November 22, 2006, 05:45:40 AM »
i would like to ask why hydroxynaphthol blue indicator instead of eriochrome Black T is used in determining the conc. of Ca2+ ion (only Ca ions).
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Offline Albert

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Re: About complexometric titration
« Reply #1 on: November 22, 2006, 02:01:41 PM »
Because the complex calcium-eriochrome isn't very stable (log Kf=5.5).
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