All Questions
Tagged with inorganic-chemistry metal
110
questions
5
votes
0
answers
224
views
Which alloy forms the thinnest sulfide surface passivation layer?
Metal sulfides seem to often form thick layers on alloy surfaces exposed to molten $\ce{S}$. Are there alloy surfaces capable of passivation with $\ce{S}$ before the layer thickness reaches $\pu{1 nm}$...
- 45
3
votes
0
answers
36
views
Thermostability of Metal Carbonates and Nitrates
While studying in high school, I came across the following thermal decomposition reactions:
$$\ce{Li2CO3 -> Li2O + CO2 }$$
$$\ce{MgCO3 -> MgO + CO2}$$
$$\ce{PbCO3 -> PbO + CO2}$$
$$\ce{Ag2CO3 ...
- 57
13
votes
3
answers
2k
views
Do electrons really hang around the electrode while ions go take a swim?
This answer to this post addresses "what happens if you dip a single zinc electrode into some electrolyte solution." It explains that
However, though the zinc ion can diffuse through the ...
- 22.5k
4
votes
1
answer
362
views
Nephelauxetic effect and covalency of metal-ligand bonds
As I was reading about nephelauxetic effects, which is the effect that atomic d-orbitals are bigger in a complex than in gaseous metal ions. The Racah interelectronic repulsion parameter gets smaller, ...
- 383
3
votes
1
answer
87
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Can Silicon hinder the precipitation of AgCl?
In my lab, I am having trouble with getting correct silver percentages.
For example, let's say a 99.99% silver sample. Digested in 10 mL of a 30% HNO3, fill up to 100 mL with DI, then concentrated (...
- 31
-2
votes
1
answer
84
views
Perfect amount of HCl to precipitate 1.000g of silver alloy
I am trying to figure out the perfect amount of HCl to drop silver out of a solution for a specific alloy.
This alloy is 79.5% - 80.25 % Ag.
We digest this (size of the sample is usually 1.000g or 0....
- 31
-2
votes
2
answers
373
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How to neutralize 60L of a 2% Aqua Regia with Various Metals suspended
I am encountering an issue in my laboratory. My supervisor and I are currently faced with the task of neutralizing a volume of 60 liters of Aqua Regia, which contains suspended metals, at a ...
- 31
4
votes
1
answer
223
views
Why does cold welding not work with carbon steels?
Cold welding is the process of joining metals using pristine surfaces without contaminents(oxide layers, oil, dust...) using pressure through atomic diffusion between the metal joints. Why does this ...
- 51
2
votes
2
answers
388
views
Why doesn't hydrochloric acid oxidize tin to tin(IV) chloride?
Diluted hydrochloric acid oxidizes tin to $\ce{Sn^2+}$ ion:
$$\ce{Sn + HCl(aq) -> SnCl2(aq) + H2(g)}$$
Why is oxidation not complete? $\ce{Sn^4+}$ has closed shell and is more stable.
- 677
7
votes
1
answer
2k
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What theory accurately explains metallic bonding in beryllium?
Since beryllium is an alkaline earth metal, the bonds between beryllium atoms could be considered metallic and we can use molecular orbital theory (MOT) to explain metallic bonds in metals.
Consider ...
- 1,644
6
votes
1
answer
67
views
How to make a thin layer of crystalline barium titanate on copper substrate?
Is it possible to create a thin $\ce{BaTiO3}$ crystal layer on a copper plate by putting the plate in a beaker, pouring in heated hydrofluoric acid that has been saturated with $\ce{BaTiO3}$ powder ...
3
votes
0
answers
497
views
What reaction does happen when molten sodium hydroxide reacts with aluminium?
The reaction between aqueous sodium hydroxide and aluminium follows this equation:
$$\ce{2NaOH + 2H2O + 2Al = 2NaAlO2 + 3H2}$$
But it's obviously not possible to balance this equation without the ...
- 41
1
vote
2
answers
1k
views
Extraction of copper from chalcopyrite
During the extraction of copper from chalcopyrite ore, the ore ($\ce{Cu2S.Fe2S3}$) is heated to form $\ce{Cu2S}$ and $\ce{FeS}$. Then during smelting it reacts with $\ce{O2}$ to form $\ce{Cu2O}$.
Then ...
2
votes
1
answer
442
views
Ferrous chloride solution coming out purple rather than green?
I've got some steel wool in hydrochloric acid to attempt to make ferrous chloride and the whole solution has turned purple. From everything I've seen it's supposed to be green. I have no idea what's ...
- 31
1
vote
0
answers
278
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Passivation of metals in acids
It is commonly taught in chemistry textbooks that metals such as $\ce{Fe, Al, Cr}$ is "passivated" in cold concentrated $\ce{H2SO4}$ and $\ce{HNO3}$ due to them forming oxide films on the ...
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