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Topic: Precipitation of Monocalcium Phosphate  (Read 1506 times)

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Offline malusdb

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Precipitation of Monocalcium Phosphate
« on: June 15, 2020, 01:30:42 PM »
Hello guys, i have an aqueous solution with Phosphate ions dissolved in it. If I add some Calcium salt, is there any way to precipitate Monocalcium Phosphate Ca(H2PO4)2 (to use as a fertilizer) rather than dicalcium phosphate or tricalcium phosphate ?

Thank you for the answers
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Offline chenbeier

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Re: Precipitation of Monocalcium Phosphate
« Reply #1 on: June 15, 2020, 01:50:17 PM »
You need phosphoric acid. Only from phosphate no way, the pH is neutral to alkaline. You need at least pH 2.
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Offline AWK

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Re: Precipitation of Monocalcium Phosphate
« Reply #2 on: June 15, 2020, 02:42:35 PM »
Quote from: chenbeier on June 15, 2020, 01:50:17 PM
You need at least pH 2.
Rather a pH about 4.6.

What phosphate?
What is its concentration?
Compare the solubilities of your phosphate and Ca(H2PO4)2
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AWK
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