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Topic: why is (NH4)2HPO4 used in the gravimetric analysis of magnesium?  (Read 1560 times)

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Offline ajax0604

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why is (NH4)2HPO4 used in the gravimetric analysis of magnesium?
« on: January 10, 2014, 07:54:12 AM »
I was wondering why magnesium is reacted with (NH4)2HPO4 in order to form Mg2P2O7. Is there another anion that magnesium could have been coupled with such as carbonate to make a precipitate?
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Offline Borek

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Re: why is (NH4)2HPO4 used in the gravimetric analysis of magnesium?
« Reply #1 on: January 10, 2014, 07:57:25 AM »
It is a matter of solubility product (the lower, the better), the form of the precipitate (it has to be easy to filter), and properties of the substance - it needs to be easy to dry out to constant mass without decomposition. Apparently Mg2P2O7 has these properties.
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