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| identify the method between Platinum and similar metal |
Platinum with silvery/white color, hardness 4-4.5, the relative density of 21.45, the chemical stability, insoluble in ordinary acids for its identification features, is easy to be identifyed from other similar metal.
Platinum the different from aluminum that it has high hardness, and change its shape is not easily, but aluminum was no flexibility, after deformation can't recover; And the density is low than platinum ,lead of 11.36, aluminum for 2.7, about 1/2 of platinum and 1/8, use hand have a try component can tell the different.
Platinum and silver to the relative density of size, hardness height, the chemical stability of the difference. Though silver for silvery white, but the relative density of 10.53, only half of the platinum; And low hardness, without flexibility, so with his nails delimit gently can also leave traces, foil chip usable hand is easily to fold, and it is very difficult to be restored; Add silver chemical properties is not stable, encounter will dissolve nitric acid, and release nitrogen dioxide gas. And platinum insoluble in nitric acid in the heated WangShui can dissolve faster, at normal temperature dissolve the extremely slow, general naked eye difficult to detect.
Platinum is very good catalyst, use this one character, can quickly identify platinum. Hydrogen peroxide is commonly used reaction method, and the specific method is: take a few articles to be tested powder, and hydrogen peroxide (H2O2) in plastic bottles, the hydrogen peroxide and immediately if platinum blister, decomposition out a large amount of oxygen, and the reaction of the platinum is still intact, and still can recycling (it only plays the accelerating decomposition); If other white metal, such as silver, lead, aluminum etc is no this reaction.
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