All Questions
Tagged with electrons electrochemistry
76
questions
-3
votes
1
answer
254
views
What is the purpose of the solution in a galvanic cell?
In other words: What is the purpose of the solution that the electrodes are immersed in, in a galvanic cell, and is it possible to generate a current without any solution?
5
votes
2
answers
784
views
Formation of species in electrolysis
I understand the principles of electrolysis of salts in aqueous solutions, but there are two points on which i am unsure.
At the positive electrode, how can you work out which ions will ...
- 726
2
votes
1
answer
2k
views
The anode and cathode when corrosion happens
Let's say $\ce{Fe}$ reacts with $\ce{Cu^{2+}}$ ions. $\ce{Fe}$ would oxidize and therefore give electrons to $\ce{Cu^{2+}}$so that:
$$\ce{Fe-> Fe^{2+} +2e-}$$
$$\ce{Cu^{2+} +2e^- ->Cu}$$
The ...
4
votes
1
answer
998
views
Reduce chlorine gas
I have a simple electrolysis setup which uses aqueous sodium chloride as electrolyte. The problem is that, the setup makes tons of chlorine gas along with hydrogen (I only want hydrogen). I didn't ...
- 563
10
votes
3
answers
13k
views
Why is chloride oxidised instead of water in copper chloride electrolysis?
For the Electrolysis of Copper Chloride:
Cathode: $\ce{Cu^{2+} + 2e- <=> Cu}$
Anode: $\ce{2Cl <=> Cl2 + 2e- }$
I am confused about the reaction taking place at the anode. Wouldn't $\ce{...
- 231
5
votes
2
answers
22k
views
Explanation for the reactions in a saltwater battery with zinc and copper electrodes
I am a physicist, not a chemist. I'm trying to get a basic understanding of the reactions taking place in a battery using a saltwater electrolyte with copper and zinc terminals. I'm writing a general ...
- 151
3
votes
1
answer
109
views
Since aqueous acids release Hydrogen cations into the solution, will an electric current create Hydrogen gas?
I was wondering that since acids dissociate in water to make a lot of $\ce{H+}$ cations. Is it possible that introducing a supply of electrons via an electric current, would create $\ce{H2}$ gas?
- 720
1
vote
2
answers
481
views
What's the voltage of a battery?
The definition of voltage I'm familiar with is the amount of electric potential energy per unit charge at a location. My prof defined the voltage of a battery to be the amount of potential energy ...
- 151
3
votes
1
answer
192
views
Intuition for electrode potential
If I connect a zinc half cell (Left hand side) and a copper half cell (right hand side), I get an E cell value of 1.1V taken from the voltmeter. If I replace the voltmeter with a light bulb, I will ...
- 2,423
7
votes
1
answer
392
views
Prediction of ionic reduction?
Here are some standard electrode potentials:-
$$\ce{SO_4^{2-} + 4H^+ + 2e^- -> SO_2 + 2H_2O}\\E^o=0.17\mathrm{V}\\
\ce{NO_3^- + 4H^+ + 3e^- -> NO + 2H_2O}\\E^o=0.97\mathrm{V}\\
\ce{NO_3^- + ...
- 6,795
3
votes
1
answer
2k
views
Electrode potentials at interfaces?
My questions relates to the fundamental concept of electrochemistry, more specifically the electrode potentials.
1) First, why is there a potential difference at the interface of two phases? ...
- 6,795
57
votes
4
answers
385k
views
Why is it important to use a salt bridge in a voltaic cell? Can a wire be used?
I was learning about voltaic cells and came across salt bridges. If the purpose of the salt bridge is only to move electrons from an electrolyte solution to the other, then why can I not use a wire?
...
- 799
3
votes
1
answer
554
views
Why does electrolysis take so much time?
What makes electrolysis or electroplating take so long ? What stage takes longer when ions are attracted to electrodes or when they gain or lose electrons at electrode.
And if we are talking about an ...
37
votes
5
answers
20k
views
Why don't the electrons move through the electrolyte (instead of the circuit) in a galvanic cell?
I was learning about galvanic cells and I had a problem understanding why electrons do not travel through the electrolyte solutions themselves, instead preferring to travel through metals. Can ...
- 483
3
votes
1
answer
1k
views
Extraction of hydrogen and oxygen from water
The apparatus that I am using is a glass container, with two electrodes,two glass cylinders, water, and a battery. In the glass container will be filled with water and two electrodes kept inside the ...
