Maximizing Chlorine Gas Production in Brine Electrolysis

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Discussion Overview

The discussion revolves around the production of chlorine gas through brine electrolysis, focusing on experimental conditions, electrode usability, and factors affecting gas production. Participants explore various aspects of the electrolysis process, including concentration of brine, electrode performance, and reaction duration.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant questions the usability of graphite electrodes after initial experiments, suggesting that oxidation may not be the primary concern if chlorine ions are preferentially discharged.
  • Another participant notes that higher concentrations of brine should lead to increased chlorine gas production, implying that saturated brine would be more effective than a 30% concentration.
  • Concerns are raised about the reaction slowing down after initial vigorous activity, with a participant seeking advice on maintaining continuous chlorine gas production.
  • There is a mention of the visibility of chlorine gas, which is typically pale green/yellow, and the possibility of it dissolving in water.
  • A participant inquires about the formation of precipitates during electrolysis and references external material for further information.

Areas of Agreement / Disagreement

Participants express differing views on the usability of graphite electrodes and the optimal concentration of brine for chlorine production. The discussion remains unresolved regarding the best practices for maintaining gas production and the implications of using previously used electrodes.

Contextual Notes

Participants have not measured the pH of the brine in subsequent experiments, which may influence the electrolysis process. There is also uncertainty regarding the effects of electrode wear and the specific conditions leading to decreased reaction rates.

Who May Find This Useful

Individuals interested in electrolysis experiments, particularly in the production of chlorine gas, and those exploring the effects of different brine concentrations and electrode materials.

pijoe
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hello. I'm new member here. i have some question regarding my brine electrolysis experiment. really hope somebody can help me. I'm using saturated brine in the compartment and graphite as electrode at anode and cathode. i can see the reaction at the anode and cathode was very vigorous and many bubble coming up from the reaction. hopefully there was chlorine gas collected at the anode (i still do not test that gas). my questions are: (1) can i used the same graphite electrode for the 2nd experiment? will the reaction be the same or the effectiveness will decrease? (2) I've read some information said that only 30% of brine in water is enough for this experiment. is that true? which one will produce more chlorine gas, 30% concentration of brine or saturated brine? (3) based on my experiment, the reaction seems stopped after half an hour later. why this happen? what should i do to continuously produce chlorine gas? (4) I'm using 9volts batery for this experiment. is that ok? what is the most effective voltage/current sholud i used?
 
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what IS the second experiment?? as far as i remember, the only way for graphite to become unusable is through oxidation; but here Cl- is preferentially discharged...so you wouldn't get oxygen... i believe you can still use the grphite electrode...

as long as Cl- is found in a greater concentration than OH-, Cl- will be preferentially discharged. The higher the conc of the brine, the more Cl2 you will get obviously.

and to get more Cl-, increase its concentration...

Chlorine is normally a pale green/yellow gas,...so you would be able to see if it is formed. but i think most will dissolve in the water.

i did electrolysis only last year...so i might be wrong...better confirm it
 
graphite become unusable

i already test the gas. it is chlorine gas. but when i used the same graphite for the other experiment, it seem like become unusable. the reaction (bubbles produce) was very very slow compared to the first experiment. why this thing happens? what should i do to continuously produce chlorine gas from the experiment.
 
You may find some answers here. Did you measure the pH of your brine in the second experiment?
 

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