All Questions
12
questions
-2
votes
2
answers
372
views
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
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 ...
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
views
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 ...
- 482
6
votes
1
answer
968
views
Boiling sodium hydroxide in stainless steel cup: Solution turning to a blue color
I boiled highly concentrated sodium hydroxide in a stainless steel cup. This created a blackish layer on the bottom of the cup and turned the colour of the sodium hydroxide solution to blueish.
Am I ...
- 63
-2
votes
1
answer
41
views
Is Cu stable as Cu(H2O)2+ for determination on MP-AES? [closed]
I have an unknown sample of mineral which I need to dissolve in nitric acid. I need to analyze $\ce{Cu}$ from it on MP-AES. Do I need to add $\pu{1ml}$ of $\ce{HCl}$ to stabilize $\ce{Cu}$, or it is ...
- 5
0
votes
1
answer
810
views
The test of metal hydroxides and metal oxides
Is testing metal oxide different from testing metal hydroxide using a litmus paper?
10
votes
1
answer
7k
views
0
votes
1
answer
1k
views
Can metal oxides react with water to form a hydroxide, then that with HCl to make a salt?
Lets say I have a metal oxide and I put it in water, and it reacts. As far as I know, only metal oxides from group 1 and 2 react in water, making hydroxides.
Now here is my question: If I add HCl ...
- 11
3
votes
0
answers
261
views
Relative etch rates of nitric acid on metals and oxides
I am trying to either find or calculate the etch rate of nitric acid ($\ce{HNO3}$) for various different metals and oxides. The ones I am interested in are titanium ($\ce{Ti}$), zirconium ($\ce{Zr}$), ...
- 81
7
votes
3
answers
7k
views
Aqua regia and nascent chlorine
Aqua regia has the famous property of being able to dissolve noble metals, like gold and silver. I read that this has to do with the generation of nascent chlorine. How does this happen and how does ...
- 545
11
votes
4
answers
3k
views
Why does polonium form acidic oxides?
All metals form basic oxides. Metallic oxides are basic in character.
Polonium is a metal, so it should form basic oxides but it forms acidic oxides. Why are its oxides acidic in character?
- 151