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Author: Subject: What is this metal?
vano
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[*] posted on 4-5-2021 at 03:59
What is this metal?


Hi today i found chemical jar, full of this metal pieces, label was lost. I don't know exactly what it is. First it is hard and have low melting point, but it isn't tin or lead(its hard), also not zinc because it didn't dissolved in conc. HCl and dillute H2SO4. Not cadmium because when i melted this granules, colored oxide didn't produce. I think its pure metal, I've seen metal alloys in lab, but always they are powders.

received_4065233390193696.jpeg - 238kB




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Sulaiman
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[*] posted on 4-5-2021 at 04:21


Indium ?




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vano
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[*] posted on 4-5-2021 at 04:24


No, i have indium, You can chew it like gum.

After melting:

received_170691021612181.jpeg - 204kB




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woelen
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[*] posted on 4-5-2021 at 04:28


Does it dissolve in conc. HNO3?
What if added to a mix of conc. HCl and 30% H2O2?

If it dissolves in one of the above, what color does its solution have?




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vano
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[*] posted on 4-5-2021 at 04:37


Thanks woelen. I thought that, i have azeotropic nitric acid and 50% peroxode but unfortunately in another city. Here i have mentioned acids, conc phosphoric acid (i think it isn't interesting) and hypochlorite 15% solution, i will use hypochlorite. Either way I do, I’m sure it will dissolve in nitric acid



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[*] posted on 4-5-2021 at 14:13


Flame test.
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rockyit98
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[*] posted on 4-5-2021 at 14:36


easiest way is to find out density using lab scale and do a comparison . also try and find the melting point if can.



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[*] posted on 4-5-2021 at 14:40


Zinc can be passivated and not react with acid in the absence of copper.



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[*] posted on 4-5-2021 at 16:49


Quote: Originally posted by DraconicAcid  
Zinc can be passivated and not react with acid in the absence of copper.


Yes, it'd be interesting to see what happens on mixing it with sulphuric again but with a dash of CuSO4 chucked in.
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[*] posted on 4-5-2021 at 17:18


It's better to add HCl, sulfuric acid is somewhat dull in this. Piece of aluminium foil refuse to dissolve in battery acid even when heated.



If you are interested in aqueous inorganic chemistry look at https://colourchem.wordpress.com/main-page/

I can offer GC analysis of samples. Just U2U to me for more info.

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paulll
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[*] posted on 4-5-2021 at 17:24


Quote: Originally posted by Bedlasky  
sulfuric acid is somewhat dull in this. Piece of aluminium foil refuse to dissolve in battery acid even when heated.

...whereas with a little Cu2+ in the mix it should react quite nicely with Zinc.
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[*] posted on 5-5-2021 at 00:18


Quote: Originally posted by DraconicAcid  
Zinc can be passivated and not react with acid in the absence of copper.
Objection, i tried dissolving Zn in dil H2SO4 without adding any Cu containing substances and they did react.

[Edited on 210505 by fusso]
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UranylPeroxysulfate
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[*] posted on 5-5-2021 at 00:39


Zinc does dissolve in acid (both hydrochloric and sulfuric) without copper. Aluminum doesn't dissolve in sulfuric acid unless heated to ~80C.

I looked up a list of metals with a low melting point, here are some possibilities:
Silver: m.p. 962C. Matches all the chemical properties you described.
Bismuth: m.p. 271C. Matches all the chemical properties you described except that it produces colored oxides when melted.

Less possible ones:
Thallium: m.p. 304C. Too soft and dissolves in HCl.
Cerium: m.p. 795C. Too reactive; it even reacts with water. The same goes for lanthanum with m.p. 920C.
Plutonium: m.p. 639C. Dissolves in HCl. I don't really think you can have plutonium.





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[*] posted on 5-5-2021 at 00:44


Another note:

Very few metals dissolve in hypochlorite solution. If you don't have HNO3 or H2O2, I suggest electrolytically oxidizing the metal into a dilute HCl solution and look at the color of the solution. This method can even dissolve gold and platinum if done correctly.




If something does work, sulfonate it.
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[*] posted on 5-5-2021 at 00:58


I have but not here, I will try this reactions maybe a week later. It didn't dissolved in hypochlorite, but next i added acid and when chlorine produced foil of this metal almost disappeared, only left some black piecies.



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[*] posted on 5-5-2021 at 05:01


Bismuth?

Does it feel unusually dense if you hold a bunch of granules in your hand?

Try concentrated H2SO4, or add hydrogen peroxide to your hydrochloric acid.
Or nitric acid, if you have that.


[Edited on 5-5-2021 by phlogiston]




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[*] posted on 5-5-2021 at 06:04


No it isn't Bismuth. I have many metals, but It does not look like them. That's why I'm very interested. Thank you I will try (week later).



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[*] posted on 5-5-2021 at 07:15


Quote: Originally posted by zed  
Flame test.

+1




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[*] posted on 5-5-2021 at 09:19


Great idea Sulaiman
Sense we don't have a post voting
Like a group populated answers poll.

Flame test
+1

I'm guessing aluminum because when you dissolve aluminum wire sometimes black pieces come off. Sometimes it's white or gray.


The density can be checked by weighing the object then using the water displacement trick. The change in water volume is used as the volume.

[Edited on 5-5-2021 by symboom]




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[*] posted on 5-5-2021 at 09:30


I will make flame test, but before that it must be dissolved in acid, at least one week i can't. I will determine the density with water. Thank you everyone for your ideas.

[Edited on 5-5-2021 by vano]




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[*] posted on 5-5-2021 at 09:40


could it be an alloy like Woods metal or Rose's metal?
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[*] posted on 5-5-2021 at 10:11


Hmm interesting. It has really low melting point, it instantly melted. I will put it in boiling water. Almost all alloys in lab are powder, but Wood's metal and such metals which have low melting point maybe not. Thanks!



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[*] posted on 5-5-2021 at 12:37


Quote: Originally posted by UranylPeroxysulfate  
Zinc does dissolve in acid (both hydrochloric and sulfuric) without copper. Aluminum doesn't dissolve in sulfuric acid unless heated to ~80.


if you add little HCl to the dilute H2SO4 it makes a huge of different to reaction with Al room temperature. once the reaction gets going the heat will make it more so , also it will also boil the initial HCl but since the hotter reaction temperature will compensate for that.




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vano
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[*] posted on 6-5-2021 at 02:53


It's melted in boiling water. I will determine density and that is. Dissolve in acid isn't necessary.

received_471994137411164.jpeg - 125kB received_158206676245440.jpeg - 194kB




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[*] posted on 6-5-2021 at 03:21


Where can i found alloys with density ?

[Edited on 6-5-2021 by vano]




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