Volume of Gasses Obtained by Electrolysis of Salt Solution

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Discussion Overview

The discussion revolves around calculating the volume of gases produced by the electrolysis of an aqueous sodium nitrate (NaNO3) solution, specifically addressing a change in mass fraction from 40% to 60%. The context includes considerations of pressure and temperature during the process.

Discussion Character

  • Homework-related
  • Mathematical reasoning
  • Debate/contested

Main Points Raised

  • One participant asks how to calculate the volume of gases produced during electrolysis given specific changes in mass fraction and conditions.
  • Another participant suggests that there is insufficient information to solve the problem without knowing the initial amount of the solution, proposing to express the answer in terms of volume of gas produced per kg of electrolyzed mixture.
  • A third participant references a textbook answer indicating a total gas volume of 169.2 dm3, but this is contested.
  • The initial responder reiterates that the provided information does not allow for deriving the textbook answer.

Areas of Agreement / Disagreement

Participants generally disagree on the ability to calculate the volume of gases produced based on the information given. There is no consensus on the validity of the textbook answer or the sufficiency of the provided data.

Contextual Notes

Limitations include the lack of initial solution amount and the dependence on specific definitions of the electrolysis process. The discussion does not resolve the mathematical steps necessary to reach a conclusion.

CroSinus
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Please post this type of questions in HW section using the template and showing your work.
Hello everybody!How can I calculate the volume of gasses produced by electrolysis of an aqueous solution of NaNO3 if the mass fraction of the salt changed from 40% to 60% (before electrolysis the mass fraction of the salt was 40% and after electrolysis it changed to 60%)? Pressure and temperature are 20 ºC and 99,8 kPa.Can you help me with my problem, please!

CroSinus
 
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Not enough information to solve the problem - you need to know what was the initial amount of the solution.

You can at best give the answer in terms of "volume of gas produced per kg of electrolyzed mixture".

Try to assume you started with 1 kg of mixture - does it help?
 
Thank you very much Borek for trying to help me.
The answer from my textbook says: V(O2) + V(H2) = 169,2 dm3
 
As I said - no way of getting this answer from the information you gave in this thread.
 

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