Kohlrausch’s Law – Electrochemistry – Chemistry Class 12
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Kohlrausch’s Law – Electrochemistry – Chemistry Class 12


Do subscribe to Ekeeda Channel and press bell icon to get updates about latest engineering HSC and IIT JEE main and advanced videos Hello Friends in the last lecture we have studied that the for a strong electrolyte we could easily calculate the lambda naught that is the maximum limiting value for the strong electrolyte formula conductivity but for me correctly it was very much hectic and it was cannot be finer but for this thing we have helped but for this thing we have bought an equation which is based on corner table from where we could find the lambda naught that is the maximum limiting value for the molar conductivity so let us see what is for rational so before understanding what is scholar so let us understand what is the definition of the cockroach law and what does it states it states that and infrared diffusion each is my greatest independently of its coil and make its contribution to the total molar conductivity of the electric irrespective of the nature of its ID it says that an infinite dilution the cation and an N the both contribute some amount of the molar conductivity for the whole electronic and in this case the cation and irrespective of the nature of its cohen and has my calculating this to Munna conductivities of a cation and bullock and rittany of an NN we could estimate that what would be the molar conductivity of a particular solution at infinite tension for that case we have derive the formula in this way where lambda naught is the molar conductivity of a particular solution or of a particular enabling infinite dilution so for that it is the combination of molar conductivity of the ion that is molar conductivity of the cation and infinite dilution and molar conductivity of and then at infinite dilutions so this makes where lambda naught of plus is nothing but molar conductivity of Quetta at infinite dilution while lambda knot of – that it it is mula conductivity of ni at infinite dilution so by the help of this we could estimate what would be the molar conductivity of a particular electrolyte for example if I consider an example like this one if you know the molar conductivity of KCl and if we know the molar conductivity of NaCl so by this we could estimate what would be the overall molar conductivity of that particular solution so let me give an example of that if I consider the molar conductivity of KCl then I could write in this way that is lambda naught of k plus plus lambda naught of CL minus – of lambda not of any plus plus lambda not of CN – in this case I could write it in this way like lambda not of k plus plus lambda not of CL – which is minus of lambda not of any plus minus lambda naught of CN – in this case we could see that this lambda naught of CL and this lemon out of case Allah has been tense alone and what we have got is lambda naught of k plus minus lambda naught of na plus and it has been found that the molar conductivity of this cation and of that is for potassium and for the sodium the difference was found to be the same as if we have taken a solution and we have described a solution for ki and mea so let us see what will be the value in that situation so if I consider lambda naught of ki minus lambda naught of N and if I have calculated all of her try to determine what would be the molar conductivity of this cations then the answer would be written as in this way and it’s lambda naught of k plus plus lambda naught of I minus I I let indirectly minus lambda naught of any plus minus lambda out of I minus in this case this two will cancel out each other and the rest that will remain with me is lambda naught of k plus minus lambda naught of an A plus so in this case as we could see that the both have the same in that is lambda naught of k plus minus lambda naught of any plus while here in this case also lambda naught of k plus minus lambda naught of endless so means that this two equations that we have derived or that we have estimated the both are not dependent on that particular and so this shows that the molar conductivity of a particular electrolyte depends individually on its cation as it depends individually on its and then also so this plays a very vital role in showing that the cations also contribute their value for the total molar conductivity of a particle electrolyte in a solution for example suppose this Quadra flow is very much validate or it is very much influential to calculate the molar productivity of a weak electrolyte how let me do if I consider strong it rides like the lambda naught of X in the lambda naught of sodium acetate and the lambda of M is here in this case all the three are very strong electrolytes and with the help of this values we could estimate what would be the value of the V electric suppose in this case I need the weak electrolyte like acetic acid to be estimated the value of the molar conductivity to be estimated how can I do that see it is very much simple the lambda naught of ch3cooh can be calculated in a form where if I sum up the lambda naught of sodium acetate and exhale and if I am eliminated or if I subtract this value that is lambda naught of Arison then I could possibly get the value of the lambda naught for acetic acid or the molar conductivity at infinite attention for acetic acid let us see so if I add up ch3coo ne plus lambda naught of HCl minus lambda naught of NECN in this case what I could get is lambda out of ch3co for minus plus lambda naught of na plus plus in for this case lambda naught 4-h plus minus lambda naught say plus lambda naught of C n minus 1 in this case I would get minus lambda naught of na plus y minus lambda naught of CL minus so in this case if I observe I could see that this na plus and this NFS we cancel out each other when this CL and this CL value of the molar conductivity of the entities in case of cl minus they will cancel out each other and the thing that is left with me is lambda naught of ch3co minus plus lambda naught of h plus and then this are no the sum of the molar conductivity of a particular cation and molar conductivity of a fatima NN at infinite dilution and this will give an overall value of the molar conductivity of a weak electrolyte so this is how the corrosion law has helped to estimate the value of the molar conductivity of a vehicle a plate at infinite dimensional soup which was not been estimated in graphically that we have did earlier so this was the most important thing that we have learned now so thank you friends for watching this video I hope you have liked this video and even share this video with your friends and please don’t forget to subscribe you get a channel thank you so much

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