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Topic: Phosphate Precipitation using Calcium Hydroxide?  (Read 4158 times)

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Offline osiris

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Phosphate Precipitation using Calcium Hydroxide?
« on: December 05, 2007, 08:21:19 PM »
hello all,

I'm curious if PO4 can really be precipitated in seawater using calcium hydroxide. Any truth to this?

thanks very much. :)


Marty
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Offline Dan

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Re: Phosphate Precipitation using Calcium Hydroxide?
« Reply #1 on: December 06, 2007, 03:51:18 AM »
Calcium phosphate has a very low water solubility, so you would be able to precipitate out calcium phosphate from an aqueous solution containing phosphate ions using calcium hydroxide.

Seawater is a complex mixture though, so depending on what is in there you could get other compounds precipitating out as well as the calcium phosphate.
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Offline Sev

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Re: Phosphate Precipitation using Calcium Hydroxide?
« Reply #2 on: December 06, 2007, 09:05:50 PM »
CaHPO4 is also insoluble.
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Offline osiris

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Re: Phosphate Precipitation using Calcium Hydroxide?
« Reply #3 on: December 07, 2007, 01:23:33 AM »
thanks very much for the replies, dan and sev. much appreciated.  ;D
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