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Acid base Indicators
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Topic: Acid base Indicators (Read 2184 times)
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gentlekboy
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Acid base Indicators
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on:
June 05, 2018, 10:46:06 AM »
Please how can methyl orange and phenolphthalein be prepared in the laboratory?
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Borek
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Re: Acid base Indicators
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Reply #1 on:
June 05, 2018, 10:57:59 AM »
Google "phenolphthalein synthesis".
Unless you mean preparing solutions to be used as indicators, when you already have the substance. Then it is just a matter of finding what concentration is suggested (any good analytical textbook with practical section should have this information) and preparing solutions.
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ChemBuddy
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Arkcon
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Re: Acid base Indicators
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Reply #2 on:
June 05, 2018, 11:59:21 AM »
The simple answer is, this way:
https://en.wikipedia.org/wiki/Phenolphthalein#Synthesis
The longer, more involved answer is -- that's not as easy as it looks, so it isn't done, but instead purchased.
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Hey, I'm not judging. I just like to shoot straight. I'm a man of science.
gentlekboy
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Re: Acid base Indicators
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Reply #3 on:
June 05, 2018, 06:21:32 PM »
I meant "preparing solutions to be used as indicators". I don't have a textbook that's why I need your help
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Arkcon
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Re: Acid base Indicators
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Reply #4 on:
June 05, 2018, 09:27:17 PM »
If you have the solid, the USP specifies 1 gram in 100 mL alcohol. That's a nominally correct 1% concentration, because you're using a few drops anyway, and a more accurate solution concentration isn't needed.
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Hey, I'm not judging. I just like to shoot straight. I'm a man of science.
Borek
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Re: Acid base Indicators
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Reply #5 on:
June 06, 2018, 02:42:57 AM »
Googling for "how to prepare methyl orange indicator solution" yields plenty of hits.
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ChemBuddy
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gentlekboy
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Re: Acid base Indicators
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Reply #6 on:
June 06, 2018, 02:22:23 PM »
Okay... Thanks, Borek and Arkon!
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