Thank you for the informative video. I noticed one small error in your calculations. I believe the calculation for the enthalpy delta H should be -slope*R. This would give however not give you a negative enthalpy (as we would expect for a physisorptive process) but rather a positive one, not impossible but quite uncommon. I am seeing this same uncommon behaviour in my data but know this to be untrue as my adsorption isotherms follow a downward trend as temperature increases ( in keeping with an exosthermic process under le chatiliers principle) Do you have any guidance on this? I also have a question regarding KL. You state it is equal to qe/ce, but this would allow for there to be many values of KL as i understand it. I understand you use the KL from the langmuir isotherm but in this case, KL is not equal to qe/ce. Could you help in this matter? Thanks
KL is not equal to ce/qe. It is equal to the product of the K value of the most representative isotherm (which doesn't always mean the highest fit isotherm - 10.1016/j.molliq.2023.123107)*the molar weight of your adsorbate (in mg mol-1)*the molar activity coefficient (gammaM)*the activity coefficient (gamma). I suggest reading: 10.1016/j.molliq.2018.10.048, 10.1016/j.molliq.2020.113315.
Sir my kl value is decreasing with increasing in temp....is it possible..??sir please reply 🙏 Is it okay or any problem is there....and m getting the graph in other way so it is a possibility or not please reply And sir my intercept value comes as negetive
Thanks, it was really helpful.
Could you please make a video on how to calculate uncertainties for activation parameters
Thank you for the informative video.
I noticed one small error in your calculations. I believe the calculation for the enthalpy delta H should be -slope*R. This would give however not give you a negative enthalpy (as we would expect for a physisorptive process) but rather a positive one, not impossible but quite uncommon. I am seeing this same uncommon behaviour in my data but know this to be untrue as my adsorption isotherms follow a downward trend as temperature increases ( in keeping with an exosthermic process under le chatiliers principle) Do you have any guidance on this?
I also have a question regarding KL. You state it is equal to qe/ce, but this would allow for there to be many values of KL as i understand it. I understand you use the KL from the langmuir isotherm but in this case, KL is not equal to qe/ce. Could you help in this matter?
Thanks
KL is not equal to ce/qe. It is equal to the product of the K value of the most representative isotherm (which doesn't always mean the highest fit isotherm - 10.1016/j.molliq.2023.123107)*the molar weight of your adsorbate (in mg mol-1)*the molar activity coefficient (gammaM)*the activity coefficient (gamma). I suggest reading: 10.1016/j.molliq.2018.10.048, 10.1016/j.molliq.2020.113315.
Sir my kl value is decreasing with increasing in temp....is it possible..??sir please reply 🙏
Is it okay or any problem is there....and m getting the graph in other way so it is a possibility or not please reply
And sir my intercept value comes as negetive
Please follow the description box📦. There are articles that will be helpful to you. 🙏
I realised there seems to be a mistake in the DeltaH equation.. should it be delta H = to -slope x R?
yes, you are right, a - is needed before the slope..
Grt 👍
Why we do these calculations?
Sir/Ma'am, please read some articles... related to this topic
but KL should be dimensionless
You are right. Kl should be made dimensionless. There is a paper that solves this problem.