AB Sir Electochemistry part 1

Added: 2026-05-18

[00:00:00]so career will star electrochemistry so in this particular chapter basically you are going to study about the electrochemical reactions that electrolytic reactions and you are going to study the factors which effects that on the vice-versa Riggins now first of all body is electro chemistry electrochemistry is that particular subject in chemistry or that particular chapter in chemistry we deals with the electrochemical reaction that is means it deals with the conversion of chemical energy to electrical energy and vice versa we can say that electrical to chemical and the factors affecting the rate of this particular reactions and all these things we are going to study in this particular time so basically what I said we are going to study about the electrochemical reactions that is the conversion of chemical energy to electrical energy or electrical to chemical now conversion of chemical to electrical energy like for example I will give you look in your house you seen it that is the inverter we have it so what it does when the current goes off you are getting the current from it the battery an inverter is sitting there so the battery what it does there what is the workday what it does it converts chemical energy to electrical energy now remember that that is a spontaneous reaction that particular reaction which is taking place it's a spontaneous reaction there is a what I can say a decrease in the free energy of the reaction that is Delta G is negative if you remember in the last year you have studied in thermodynamics the value of del G is negative because it is a spontaneous reaction yes it is a spontaneous reaction as now as the current goes we can say that for example let us say a power cut is there for half an hour you are getting the continuous of my from it this way chemical energy scampered into electrical energy what is that chemical energy the diode sulfuric acid which is being stored here sorry for that time for that reason time to time your Adi this will want to it if you know that other things so it converts chemical to electrical it's a spontaneous reaction there is a decrease in the free energy of the reaction that is Del G value is negative we can say that that what it happens in an electro chemical reactions chemical to electrical this is the principle we can say that yeah now another one which I've studied also in the lower classes that is your electrolytic reactions electrolytic reactions what happens is an electrical energy is converted into chemical energy now that your if you think of when the current is there all right when the current is here what happens to the inverter to the bathroom it converts the body can say the electrical energy to chemical energy that means electrical energy is stored there the electrical energy is being stored there with the battery in the form of chemical energy means over there and the current goes on this chemical energy is converted into electrical energy so conversion of electrical to chemical that is called electrolytic reactions or electrolysis freakin smack it is not a spontaneous reaction not a spontaneous reaction because as long as the current is passing through it electrical is converted to chemical as long as the current passes through it you switch off the current it will not be converted to electrical to chemical Williams man so this reaction is not a spontaneous reaction it is a non spontaneous reaction because of that it is a non spontaneous reaction you know the value of Delta G will be positive because of that what is the basic idea there are party events studying this particular University basically of such studies will be related to electrochemical reactions we can say that all right now this amount that we are having another two types of reaction is also there all right we are having that is metric conduction metallic conduction and we are having that is electrochemical conduction electrochemical conduction regardless what is your valid conduction another ratio electrochemical conduction now what is the difference you know that current passes through what I can say copper wire yes you know house it passes the copper wire definitely the current is distributed with the help of the aluminum housing so that particular conduction is for that metal conduction and you know chemical production I said when the electrical energy Delta chemical energy is converted into electrical energy or electronic conduction also electrical energy is converted into chemical energy we can see now here the current is flowing by the hand of free electrons which is been present in the wire listen carefully now here the current is flowing by the help of the free electrons which is being present like copper it is a good conductor of your city because it contains large number of free electrons all right but here the electrochemical conduction the current flows with the help of a free ions should I even write it down this one what I am saying you make two columns and write it down listen and write here the current flows with the help of the three ions what it is which are being produced for example you know that that is let us say sodium chloride and taking electrolyte it dissociates to give you na plus + CL - so the presence of this 3 ions helps in the conduction of low density alright so here the current flows will help of Rihanna's now now give me the change takes place when the current flows through the copper where is any chemical changes taking place no no chemical changes takes place alright but here yes I become position reaction in state movies alright a decomposition reaction is taking place a reversible decomposition reaction the explicit fine next here in case of metal conduction so what you find is that the matter is not transferred from its position these copper at itself is being operator itself is going from its position no matter L is not transferred matter is matter matter remains in its own position here the matter is transferred sodium ion chloride chloride and there the ions there itself matter matter is getting transferred from its position we can say that okay so there is a transfer of matter from one end to the other end we can say that now next is that is metalic conduction what if I decide as I said you that it is taking place for the free help of free electrons electro chemical free ions now here that these chemical reaction does not matter but against it does not take place the piece what if I decide only the physical conditions changes because so yeah but you can say here there can be no chemical change is taking place here a chemical change is Sigma presidency and decomposition reaction we can say take place reversible reaction in second please all right so here that is you find it out that these are the some of the differences between metalic conduction and electrochemical our electrolytic conductions I so say that right now after we are having on basic on this we are having that is two types of electrolyte because you see for electrolyte conductions electrochemical transaction for electrochemistry rather than should say marker we want to electrolytes correct we are having two electrolytes what is that we are having strong electrolyte and we are having weak electrolytes strong electrolyte and we electrolyte of course not electrolyte is there but that is of no use to us now strongly applied is what strong electrolytes are those electrolytes which dissociates almost completely into science they have another strong your class which dissociates almost completely into its I don't don't say dissociates completely not because efficiencies never hundred percent suppose if you're dealing hundred molecules are strongly employed it will not dissociate 100 will not associate Maxim - Maxim 99 will dissociate all right Maxim - Maxim 99 because some energy will be wasted in overcoming friction in overcoming resistance and all these things because of that so strongly act like secondary beat strongly acolytes are those electrolyte so it dissociates almost completely into its ions the degree of dissociation is maximum becomes a greater than 30% the degree of dissociation or a degree of dissociation has studied in the first chapter that is your theta alpha degree of dissociation this rate is greater than positive degree of dissociation is greater than 38% and here it will be definitely it will be less than much much less than critical modulus then for a person against that so now a weak electrolyte so those electrolytes it does not dissociate almost completely into excites or rather I should say the cliff legs are those inner products will dissociates feebly into it science Finley partially it associates now for example we can say that here if you take 100 molecules of a dilute extra so for now diluted so so far is a strongly attached all right if you take hundred molecules and added extra support then it will 99 let us say well just sit into exams but if you take a hundred molecules of ammonium hydroxide ammonium hydroxide then hardly a 10 or 15 event associate or maximum to be dissociated into exact so it has man that is the difference between strong and we collect event we cancel that now there are very strongly applied severe mineral acids diet axial remember I use not concentrated concentrated means it is a covalent substance diet means when I dissolve in water then it becomes one can say ionic because water has got a high dielectric constant which helps to dissociate the electrolyte into its ions that's it so here Daniel exhale dilute extra so for dilatational free all these are considering the case of dinner Lance accept and consider to be a strong unit similarly sodium hydroxide Equus but I shall take the outside Equus but if they can say to be a strong element Saurus basically all the sorts of strong acids and strong bases like NaCl KCl kno3 and no.3 but it's either solution on that short solution up see all right always it should be in solution state because in solution state only dissociates into it science like in lower classes your study then why solid sodium chlorate does not conduct leave city solid sodium chloride why it does not conduct leaves abhi he does not attack science a lot of course it contains science but ions are not free in case of solid state but in accra solution state that ions are free you have seen the equations are staggering alright when you dissolve sodium chloride in water just now I said you water hands to dissociate into its ions which one sodium chloride into its ions why because water has got a high dielectric constant due to which sodium chloride dissociate into its ions so sorts of strong acids and strong bases of strong acids weak bases and because its strong bases also behaves as a strong ligament but the weakly applied are ammonium hydroxide like calcium hydroxide sorry maybe show you can say that there we click like similarly weak acids like your organic acids like cyclic acid acetic acid acetic acid no vinegar alright so carbonic acid they are considered to be asked we click like similarly there is the salsa week basically all sounds a strong ligament some salsa day like suppose if you say words that make salsa weak acid and Equus we consider big bass means like ammonium formate or ammonium acetate they may behave as a vehicle applied big answer that so this is about this strong weak electrolyte I say thank you very much