Exploding Water: The Science Behind Electrolysis and Hydrogen Creation

  • Thread starter Thread starter ucf-fisher21
  • Start date Start date
  • Tags Tags
    Water
Click For Summary

Discussion Overview

The discussion centers around the electrolysis of water, specifically the processes involved in separating water into hydrogen and oxygen gases, and the conditions under which these gases might react explosively. Participants explore the relationship between electricity, heat, and chemical reactions in both aqueous and gaseous environments.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant questions why the separation of hydrogen and oxygen during electrolysis does not lead to an explosion, suggesting a need for further explanation.
  • Another participant clarifies that electricity does not automatically generate heat and distinguishes between current flow in water and the presence of an electric arc.
  • Several participants express confusion about the concept of an electric arc and the relationship between electricity and heat, requesting further clarification.
  • There is a proposal that in a closed system with only hydrogen and oxygen gases, applying an electric current could lead to a reaction, contingent on the proximity of the electrodes and the voltage applied.
  • One participant notes that gases at room temperature do not conduct electricity, implying that an electric arc would be necessary to initiate a reaction in a gaseous environment.
  • Another participant emphasizes that water conducts electricity through dissolved ions, contrasting this with the conduction mechanism in wires, which involves electrons.
  • A later reply asserts that if the cathode and anode are sufficiently close and the voltage is high enough to create an arc, a reaction would indeed occur, potentially resulting in a deflagration.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the mechanisms of electrolysis and the conditions necessary for hydrogen and oxygen to react. There is no consensus on the specifics of how electricity interacts with gases or the implications for reactions in different states.

Contextual Notes

Some participants highlight limitations in understanding the activation energy required for reactions, the role of electric arcs, and the differences in electrical conduction between water and gases. These points remain unresolved within the discussion.

Who May Find This Useful

Individuals interested in electrolysis, chemical reactions involving gases, and the physics of electricity and heat may find this discussion relevant.

ucf-fisher21
Messages
46
Reaction score
0
If you send electricity through water it breaks water molecules apart and creates oxygen and hydrogen gas. If electricity is still present wouldn't that cause the hydrogen and oxygen to react and cause an explosion or release of energy?

I'm guessing this doesn't happen with electroysis of water to create hydrogen, but can someone please explain why this is?

thanks
 
Chemistry news on Phys.org
Electricity doesn't automatically equal heat. There is no electric arc, just a current through the water.
 
I still don't understand...what is electric arc? How does electricity not necessarilly mean heat? Can you explain further?

Once you have the oxygen and hydrogen separate, wouldn't you just need sufficient activation energy?
 
ucf-fisher21 said:
I still don't understand...what is electric arc? How does electricity not necessarilly mean heat? Can you explain further?

Google electric arc, not that hard to find.

Once you have the oxygen and hydrogen separate, wouldn't you just need sufficient activation energy?

Good point - but now think where does this activation energy come from. Just because there is a current flowing in the solution doesn't mean you are delivering enough energy for the activation!
 
lets take water out of the equation.

If you had a closed system filled with ONLY hydrogen and oxygen gas, and you tried apllying an electric current to the system, would a reaction occur?
 
ucf-fisher21 said:
If you had a closed system filled with ONLY hydrogen and oxygen gas, and you tried apllying an electric current to the system, would a reaction occur?
Gases at room temperature and standard pressure don't conduct electricity, so the only way to get electric current to flow through it is to arc it. An arc is lightning. That's where the heat comes from.

Water conducts electricity - like a wire. Wires don't get hot because there isn't much resistance to the flow of electricity and therefore not much heat generated. Nor is there in water.
 
russ_watters said:
Water conducts electricity - like a wire.

I know what you mean, but it still hurts :wink: Similar heat effects, completely different mechanism.
 
Fair enough. Yes, electricity in water water is through dissolved ions, in wires wires it's the 'sea of electrons'.
 
ucf-fisher21 said:
lets take water out of the equation.

If you had a closed system filled with ONLY hydrogen and oxygen gas, and you tried apllying an electric current to the system, would a reaction occur?


If the cathode and anode were close enough together, and the voltage high enough that the electricity could arc through the gas between them, yes indeed, there would be a reaction. You'd have a high speed deflagration on your hands.
 

Similar threads

  • · Replies 11 ·
Replies
11
Views
1K
  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 7 ·
Replies
7
Views
4K
  • · Replies 1 ·
Replies
1
Views
10K
Replies
2
Views
7K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 4 ·
Replies
4
Views
4K
  • · Replies 46 ·
2
Replies
46
Views
7K
  • · Replies 2 ·
Replies
2
Views
4K
  • · Replies 5 ·
Replies
5
Views
3K