Electrochemistry & Electrode Potiential

Electrochemistry

                     
                       



Hello friends today we are going to talk about the electrochemistry .In electrochemistry we have

Two types of cell

1. Electrochemical cell
2. Another one is electrolytic cell .


When we say or chemical is converted into electric we called it is electrochemical cell (Galvanic or volataic) derived by two scientist galvani and volte


the modified electrochemical cell we called Daniell cell


Point to note:- In electrode cathode will it as positive and anode as as negative

electrolytic cell


Electric changes into chemical called recorded as electrode electrolytic cell
for example:- mobile battery charging

Important

that it is opposite to electrochemical cell because we take anode as positive Cathode is negative


it should be noted that that the conventional current is from positive to negative and the electron current must be from negative to positive when we say an electron is moving


Electrode potential





                  


Ok let's talk about the electrode potential latest place a copper rod in copper sulphate solution the copper atoms tendency  to lose the electrons to two forms ions  and go into the solution which result in oxidation( The ions will go into the solution leaving the electron on the electrode). as an electrode is made up of millions billions of atoms so therefore the causes the electric charge on the electrode which we say a potential has been developed


and excess of positive charge in the solution so  will act as a postive potential


And this difference is called electrode potential difference(causes flow of electrons)


Now this  develop energy automatically which convert chemical into electrical we called this energy as Gibbs free energy taking part of redox reaction this energy allowed to Run electric gadgets like heater fan geyser. Daniel cell was earlier one of the first developed


Note:-if the reaction(two electrodes) takes place within the same beaker we called as direct reaction if the reaction taking place in the two different beaker we call one beaker as as half cell (redox reaction) and and another beaker gain called as half cell

(half+half=full cell)



The value of electrode potential depends upon
a. the nature of metal
b. concentration of ion
c. and temperature


Basically there are two types of electrode potential which go oxidation reduction take place simultaneously in the cell placed in beaker(called electrolytic cell)


when electrode metal loses charge(electrons) We called it is oxidation potential
similarly

when the excess of Ions produced in the solution it will again stick to electrode by gaining the electron already present on the electrodes we called this as reduction potential so we called oxidation and reduction takes place simultaneously


Few points to Remember


1. Strong electrolyte is one in which Ions almost completely dissociate in the solution
A weak electrolyte is one in which the degree of dissociation we can see extent of dissociation is up to the limit( not completely) giving the example we have carbonic acid)


2. Oxidation involve loss of one or more electron
Reduction involve gain of one or more electron
Electron losing species is called reducing agent
Electron acceptor species is called oxidizing agent


3. In a wire movement of electrons is there
where is in electrolytic conduction we involve the movement of ions

4. In electronic conduction there is no movement of matter
actually in electrolytic condition we have movement of matter in the form of ions


5. The electronic conduction is generally high while
electrolytic conduction is general low
6. Electronic conduction cause no change in chemical properties while
electrolytic conduction result the change in chemical because of decomposition of
electrolyte

7. Electronic conduction and electrolytic conduction increases with the increase in temperature


8.the reaction(two electrodes) takes place within the same beaker we called as direct reaction if the reaction taking place in the two different beaker we call one beaker as as half cell (redox reaction) and and another beaker gain called as half cell

9. The two half cell is joined by the Salt Bridge . The function of Salt Bridge is just to prevent just not to allow the transfer of electrolyte from one cell to another and another it helps to maintain the neutrality of the electrolyte into half cells


10 In Salt Bridge there is a thick paste of Just as gel of KCL and agar agar heated it form of thick paste which allowed to prevent the moving of electrolyte the mixing of electrolytes from one Beaker to another


11. In electrochemical cell electron are the carrier of current outside the cell outside the cell and ions are the carrier inside the cell

12.this is the most important thing we need to remember we sometimes called get hold as positive pole and anode as negative pole in electrochemical cell


13. The numerical notation of electrode potential is expressed and according to the latest are IUPAC at convention.


To measure the value of electrode potential we use the standard hydrogen electrode (SHE) or we as normal hydrogen electrode(NHE) called as which are going to discuss briefly Further


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