All Questions
Tagged with aqueous-solution electrolysis
31
questions
7
votes
3
answers
2k
views
In my homemade electrolysis setup, only the negative end bubbles?
I've created an electrolysis setup by connecting a $6~\mathrm{V}$ battery to a cup filled with saline water via pencils; I am confused as to why only the negative pencil bubbles though. After running ...
- 173
6
votes
2
answers
31k
views
Electrolysis of aqueous copper (II) nitrate
There are two copper blocks sitting in the $\ce{Cu(NO3)2 (aq)}$ solution, a battery is attached onto both of them, providing enough energy to start the reaction.
Since solid pieces of copper are ...
- 257
5
votes
1
answer
636
views
Electrolysis of water for demonstration: ideal electrolyte for safety, stability, conductivity, and ease of maintenance
I'm developing a system for educational purposes where electrolysis of water takes place. The aim is to practically show how electrical energy can be converted to mechanical, by electrolyzing water, ...
- 153
5
votes
1
answer
235
views
Change of potential difference during electrolysis while adding salt
I was conducting a simple experiment at home on electrolysis. Obviously, when you build a circuit with a 9V battery, a lamp, and put two electrodes in water you measure a potential difference of ~9V ...
4
votes
1
answer
3k
views
How does KMnO₄ affect electrolysis?
I'm just blindly experimenting. I tried to dissolve some potassium permanganate in water before performing electrolysis.
I can't see much difference. How is $\ce{KMnO4}$ dissolved in water? How does ...
- 2,518
4
votes
1
answer
224
views
Do ion-exchange membranes *always* require ions to pass in both directions?
In an answer to this question, it was asserted that:
Student always tend to forget that a solution must remain electrically neutral by all means. If you want a certain ion to leave water, you must ...
- 189
4
votes
1
answer
95
views
Why is my Ni or Fe cathode blackening and pores getting blocked during alkaline (6 M KOH) electrolysis?
I am conducting an electrolysis process for hydrogen $(\ce{H2})$ and oxygen $(\ce{O2})$ generation using a $\pu{6 M}$ $\ce{KOH}$ alkaline solution.
During the process, I have observed that my cathode ...
- 41
3
votes
3
answers
3k
views
How to separate a mixture of sodium chloride and sodium hydroxide?
I recently did a double displacement reaction in which I formed a solution of water with sodium hydroxide and sodium chloride dissolved in it. Now I want to separate both of them. How can I do this?
- 39
3
votes
1
answer
55
views
Experiment on pH vs Rate of Electrolysis - what do the results actually say?
My experimental setup looks at using different pH solutions (of $\ce{H2SO4}$ and $\ce{NaOH}$) for electrolysis of water with a Hoffman setup and then measuring the rate of production of gas (note this ...
- 39
3
votes
0
answers
80
views
Can a brine water electrolysis be looped?
Electrolysis of brine yields hydrogen and chlorine gases and aqueous $\ce{NaOH}$. So is it possible to combine the gases to form $\ce{HCl}$ gas, and mix it back with the aqueous $\ce{NaOH}$, so it ...
- 31
3
votes
2
answers
25k
views
Electrolysis of diluted sulfuric acid
My teacher told me that electrolysis of dil. $\ce{H2SO4}$ (concentration below $50\%$) using inert electrodes results in gradual increase of the concentration of $\ce{H2SO4}$.
I can't seem to figure ...
- 141
2
votes
1
answer
3k
views
Does electrolysis of aqueous tin(II) chloride produce Cl₂, SnCl₄ or both?
When applying a current to an aqueous solution of tin(II) chloride, tin crystals grow from the cathode. However, I'm not sure about the anode. It seems like there are two possible reactions:
$$\ce{2 ...
- 123
2
votes
1
answer
1k
views
Why isn't mercury electrode used to produce commercial element sodium?
I know that while electrolysing a solution of brine, if we use mercury cathode, we get sodium amalgam instead of having hydrogen gas liberated. Even the Castner-Kellner process uses this to produce ...
2
votes
1
answer
10k
views
Reaction of sulfate ion in copper sulfate electrolysis
I am planning to try copper plating a piece of metal by performing electrolysis on an aqueous solution of copper sulfate. I plan run an electrical current with the metal I want to plate as the cathode ...
- 521
2
votes
1
answer
46
views
Would ionic conduction be halted by shielding at the electrodes?
I've done this experiment myself and seen it front of my eyes. Set up a basic circuit with a battery, an LED, and connect the circuit with a salt-water solution and copper wire. The LED lights up.
If ...
- 309