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Mercurous Molybdates

When a neutral solution of an alkali molybdate is treated with mercurous nitrate, the molybdenum is completely precipitated in the form of a mercurous molybdate of uncertain composition. The precipitate on ignition is converted to molybdic anhydride, so that the reaction may be used for the estimation of molybdenum. The normal salt, Hg2O.MoO3, may be obtained in the form of golden-yellow needles by treating a solution of alkali trimolybdate with mercurous nitrate, and boiling the resulting yellowish-white precipitate with the mother-liquid. If the precipitate is immediately filtered and washed until all volatile matter is removed, the dimolybdate, Hg2O.2MoO3, remains.
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