Molybdate sentence example

molybdate
  • Several hydrated forms of the oxide are known, and a colloidal variety may be obtained by the dialysis of a strong hydrochloric acid solution of sodium molybdate.
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  • Molybdenum trisulphide, MoS3, is obtained by saturating a solution of an alkaline molybdate with sulphuretted hydrogen and adding a mineral acid.
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  • Of other lead minerals we may mention the basic sulphate lanarkite, PbO PbSO 4; leadhillite, PbSO 4.3PbCO 3; the basic chlorides matlockite, PbO PbC12j and mendipite, PbC1 2.2PbO; the chloro-phosphate pyromorphite, PbC12.3Pb3(P04)2, the chloro-arsenate mimetesite, PbC12.3Pb3(As04)2; the molybdate wulfenite, PbMoO 4; the chromate crocoite or crocoisite, PbCrO 4; the tungstate stolzite, PbW04.
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  • There are several volumetric methods for assaying lead ores, but the best known is that based on the precipitation of lead by ammonium molybdate in an acetic acid solution.
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  • A standardized solution of ammonium molybdate is then added from a burette.
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  • As long as the solution contains lead, the addition of the molybdate solution causes a precipitation of white lead molybdate.
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  • The appearance of a yellow colour shows that all the lead has been precipitated and that the solution contains an excess of molybdate.
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  • The molybdate solution should be of such a strength that i cc. will precipitate o oi gramme of lead.
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  • The salts of arsenic acid, termed arsenates, are isomorphous with the phosphates, and in general character and reactions resemble the phosphates very closely; thus both series of salts give similar precipitates with "magnesia mixture" and with ammonium molybdate solution, but they can be distinguished by their behaviour with silver nitrate solution, arsenates giving a reddish-brown precipitate,whilst phosphates give a yellow precipitate.
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  • The phosphorus in solution reacts with the molybdate ion to produce a blue coloration whose intensity is directly proportional to the concentration of phosphorus.
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  • These data were collected on a solution of sodium molybdate.
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