Category Archives: Equilibrium Chemistry

Complexometric Titration of CaO in Limestone: Analysis of Procedure

In the EDTA titration for CaO in limestone, the pH of the sample is made sufficiently basic so any magnesium thatis present will precipitate as Mg(OH)2. The adjustment of pH is fairly critical, as complications  arise if the solution is … Continue reading

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Gravimetric Method for Analysis of Phosphorous: Analysis of Procedure

Once upon a time, a common method for determining phosphorous was to convert it to phosphate, precipitate it as magnesium ammonium phosphate, MgNH4PO4, and ignite it to form magnesium pyrophosphate, Mg2P2O7.  The solubility reaction for MgNH4PO4 is MgNH4PO4(s) ↔ Mg2+(aq) … Continue reading

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Extraction and Analysis of Gingko Leaves

You may know that there is a growing interest in the ginkgo tree because herbal supplements using extracts of ginkgo are believed to aid in fighting memory loss.  A recent paper [Lang, G.; Wai, C. M. Anal. Chem. 1999, 71, … Continue reading

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Solubility of Milk of Magnesia

Milk of Magnesia, or MOM, is a suspension of Mg(OH)2.  One method for determining the amount of Mg(OH)2 in MOM is to precipitate the Mg2+ as MgNH4PO4.  Because this precipitate includes a weak acid, NH4+, and a weak base, PO43-, … Continue reading

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