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Matalic powder ??


person

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I was walking ... ok you dont need to know the details.

 

I have a jar of metalic powder that i found in a garage. It was used to make reflective paint so i asumed Al ... So to test my theory i put a pinch into HCl but nothing happened :confused: so now i am lead to believe that it is not Al. I tested it with a magnet. Its not magnetic. It is grey in colour and is quite heavy (i will work out its density and post it later)

 

Any suggestions as to how i can find out what it is ???

Much appreciated

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I`st of all you don`t mention what color the powder is, is there a reason for that?

 

a green soln does however narrow it down somewhat, now try using sodium hydroxide

Edited by YT2095
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It is a grey/silver metalic powder.

I didnt observe any reaction between it and a strong NaOH soln after 20 min.

It has a density of 3.08 g/ml

 

Something to consider, it might be an aloy.

 

P.s my density might be slightly off (i used a scale that only has one decimal).

thnx

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sounds like Copper to me, perhaps a Brass, especially the chlorides then oxides.

perhaps it`s been coated with something?

 

try dissolving in Nitric acid, and then add a a weak chloride soln to this, look for a white PPT, I`v seen Silver (alloyed with copper) have this effect.

did all the powder dissolve when you did the HCl addition?

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No not all the powder disolved (it could just be that the acid lost some acidity though)! I gree that it may be a aloy of copper but i dought it contains any silver (baught it for quite cheep).

 

It was slightly affected by a strong magnet (when i moved the magnet close i saw the particles moving a bit) but not enough for the powder to "slick" to the magnet.

 

What chloride soln should i add to the nitric HNO3 metal mix (chloride that i got from the HCl and metal mix)?

 

Thanx

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Titanium Dioxide, calcium carbonate Are used in commercial reflective paints according to their MSDS sheets.

 

Yea - TiO2 as a white pigment and CaCO3 as a filler. The reflectivity would come from metalic particulates.

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