All Questions
Tagged with aqueous-solution electrochemistry
71
questions
2
votes
3
answers
7k
views
How to convert sodium aluminate back to sodium hydroxide?
I had dissolved a bunch of aluminium foil in an aqeous solution of sodium hydroxide. The resulting solution consists mainly of sodium aluminate with very little excess sodium hydroxide.
What I want to ...
- 563
0
votes
1
answer
977
views
Why does the potential difference of a current drop, when silver nitrate is added to deionised water?
Semi-related to Why do some salt ions in solution conduct electricity better than others?
After conducting more experiments, using deionised water as an analyte only, I found the potential difference ...
- 265
2
votes
0
answers
66
views
Preparing CdSe electrodeposition bath
What is the best way of preparing an aqueous solution containing 5 mM
$\ce{CdSO4}$, 1 mM $\ce{SeO2}$, 0.5 M $\ce{Na2SO4}$ and adjusting pH to 3 by adding 0.5 M $\ce{H2SO4}$?
What is the ...
- 21
4
votes
1
answer
808
views
Will I get bromine by electrolysis of the brine from the Dead Sea?
I know that electrolysis of a saturated solution of sodium chloride with an inert anode (eg., graphite) is a handy way to obtain pure chlorine. I have a sample of saturated salt solution from the Dead ...
- 143
1
vote
1
answer
5k
views
Removing HCl from water
I have water contaminated with dissolved chlorine:
$\ce{H2O + Cl2 <=>HCl + HOCl}$
During electrolysis, this is an issue. These are my products:
$\ce{NaCl + H2O ->T[electrolysis] NaOH + Cl2 ...
- 2,518
4
votes
3
answers
9k
views
How to calculate the solubility product for PbS from galvanic potential?
Knowing that at 25 °C the following galvanic cell:
$$\ce{Pb~|~Pb(NO_3)_2~1M~||~PbS~saturated~|~Pb}$$ shows an $\mathrm{EMF} =0.413~\mathrm{V}$, find the $K_\mathrm{sp}$ of $\ce{PbS}$.
My Approach
...
- 43
9
votes
2
answers
9k
views
Why put zinc solution in a galvanic cell?
In a galvanic cell with Cu and Zn electrodes, I was taught that each electrode is immersed in a solution containing it's own positive ions. I understand why you need copper ions, so they can gain ...
- 447
2
votes
3
answers
8k
views
Electrolysis of aqueous lead nitrate
When going through one of my chemistry textbooks, I saw that the electrolysis of aqueous lead nitrate led to oxygen being formed at the anode and lead being formed at the cathode.
However, in school, ...
4
votes
4
answers
7k
views
Why is zinc deposited on copper when boiling an aqueous zinc sulfate solution?
I did an experiment where I dissolved 30 grams of zinc sulfate in water and boiled it with strips of solid zinc metal and strips of copper metal and a layer of zinc was deposited on the copper.
I ...
4
votes
1
answer
641
views
Why do aqueous solutions always have to be electrically neutral?
I was reviewing some analytical chemistry and stumbled upon a section that explained the imperfection of using a salt bridge.
It said that the using dissimilar ions is a problem because in, for ...
14
votes
3
answers
18k
views
Copper Chloride: neutralizing and disposal
I plan on etching some PCBs with hydrochloric acid and hydrogen peroxide, which will therefore produce some kind of copper chloride (green color) which is highly toxic if released into the ...
- 457