|Origin of Name
||Greek, molybdos = "lead"
||Isolated by P. J. Hjelm at Uppsala, Sweden
||Solid at 77 F & 298 K
||Metal is lustrous, silvery, and fairly soft when pure.
Usually obtained as gray powder. Used in alloys, electrodes, catalysts,
and as the sulfide, lubricants.
On charcoal molybdenum sulfide gives near the assay a copper-red stain in oxidizing
flame and white oxide further away.
On plaster, mixed with KI, gives a deep ultramarine blue color after
heating with the flame.
Bead tests using sodium phosphate (Na3PO4) gives a
yellowish green color (hot) and nearly colorless (cold), the reducing
flame color is a fine green.
Molybdates (MoO42-) are tested by adding powdered
sample to a dry test tube with a scrap of paper, adding a few drops of
water and an equal amount of concentrated H2SO4. The
mixture is carefully heated until the acid fumes. Cool or slowly add water
and the solution will assume a deep blue color.
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