MY CART (5)

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price:

There are no items in this cart.
Continue Shopping
                   

why in electrolysis of an aqueous solution of copper sulphate using copper electrodes, sulphate ions and hydroxide ion do not oxidises?


 

4 years ago

Share

Answers : (1)

                                        

hi somy, in this table of copper sulphate reaction chart , you can check the reason ...for many sulphate reactions ...


 





































































































Electrolyte cathode product cathode equation anode product anode equation comments
molten aluminium oxide

Al2O3(l)


molten aluminium Al3+(l) + 3e- ==> Al(l) oxygen gas

2O2-(l) - 4e- ==> O2(g)


or  2O2-(l)  ==> O2(g) + 4e-


Method 2 in principle: The industrial method for the extraction of aluminium its ore
aqueous copper(II) sulfate

CuSO4(aq)


copper deposit any conducting electrode e.g. carbon rod, any metal including copper itself

Cu2+(aq) + 2e- ==> Cu(s)


oxygen gas inert electrode like carbon (graphite rod) or platinum

(i) 4OH-(aq) - 4e- ==> 2H2O(l) + O2(g)


or  4OH-(aq) ==> 2H2O(l) + O2(g) + 4e-


(ii) 2H2O(l) - 4e- ==> 4H+(l) + O2(g)


or 2H2O(l) ==> 4H+(l) + O2(g) + 4e-


Adapt Method 3 - e.g. use carbon rods: The blue colour of the copper ion will fade as the copper ions are converted to the copper deposit on the cathode
aqueous copper (II) sulphate

CuSO4(aq)


copper deposit any conducting electrode e.g. carbon rod, any metal including copper itself

Cu2+(aq) + 2e- ==> Cu(s)


copper(II) ions - the copper anode dissolves copper anode

Cu(s) - 2e- ==> Cu2+(aq)


or  Cu(s) ==> Cu(s) + 2e-


See Method 3: This is the basis of the method of electroplating any conducting solid with a layer of copper. When using both copper cathode and anode, the blue colour of the copper ion does not decrease because copper deposited at the (-) cathode = the copper dissolving at the (+) anode.
molten sodium chloride

NaCl(l)


molten sodium Na+(l) + e- ==> Na(l) chlorine gas

2Cl-(l) - 2e- ==> Cl2(g)


 or  2Cl- ==> Cl2 + 2e-


Method 2 in principle: This a method used to manufacture sodium and chlorine. See Down's Cell
aqueous sodium chloride solution (brine)

NaCl(aq)


hydrogen

2H+(aq) + 2e- ==> H2(g)


or 2H3O+(aq) + 2e- ==> H2(g) + 2H2O(l)


or 2H2O(l) + 2e- ==> H2(g) + 2OH-(aq)


chlorine gas

2Cl-(aq) - 2e- ==> Cl2(g)


 or  2Cl- ==> Cl2 + 2e-


Method 1a: This is the process by which hydrogen, chlorine and sodium hydroxide are manufactured
hydrochloric acid

HCl(aq)


hydrogen gas 2H+(aq) + 2e- ==> H2(g) chlorine gas

2Cl-(aq) - 2e- ==> Cl2(g)


 or  2Cl- ==> Cl2 + 2e- 


Method 1a: All acids give hydrogen at the cathode
sulphuric acid

sulfuric acid


H2SO4(aq)


hydrogen gas 2H+(aq) + 2e- ==> H2(g) oxygen gas

(i) 4OH-(aq) - 4e- ==> 2H2O(l) + O2(g)


or  4OH-(aq) ==> 2H2O(l) + O2(g) + 4e-


(ii) (+) 2H2O(l) - 4e- ==> 4H+(l) + O2(g)


or 2H2O(l) ==> 4H+(l) + O2(g) + 4e- 


Method 1b: All acids give hydrogen at the cathode. Whereas hydrochloric acid gives chlorine at the anode, the sulfate ion does nothing and instead oxygen is formed. This is the classic 'electrolysis of water'
molten lead(II) bromide

PBr2(l)


molten lead Pb2+(l) + 2e- ==> Pb(l) bromine vapour

2Br-l) - 2e- ==> Br2(g)


 or  2Br- ==> Br2 + 2e-


Method 2: A good demonstration in the school laboratory - brown vapour and silvery lump provide good evidence of what's happened
molten calcium chloride

CaCl2(l)


solid calcium Ca2+(aq) + 2e- ==> Ca(s) chlorine gas

2Cl-(aq) - 2e- ==> Cl2(g)


 or  2Cl- ==> Cl2 + 2e-


Method 2 in principle: The basis of the industrial method for the manufacture of calcium metal
           
************** ************ **************************************************** ********** ******************************************************* *************************************
4 years ago

Post Your Answer

More Questions On IIT JEE Entrance Exam

Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!!
Click Here for details
WHAT BOOKS SHOULD BE PREFERRED FOR CALCULUShat books are to be prefrred for calcolus
 
 
Arihant Differential Calculus nd Integral calculus
 
JAinil 3 months ago
 
Calculus by IA Maron is a really good book.
 
Ram 3 months ago
after passing 9 th what i have to do for my iit career?
 
 
Hello Student, ITs very good that you have started so early. For JEE your foundation base should be very strong. Right now you can prepare for exams like NTSE, Olympiad, KVPY , etc which...
  img
Nishant Vora one month ago
 
Hi Student, Please enroll for askiitians classes if you want iitjee level preparation from 9 th class.
  img
Harishwar one month ago
How much in an hour would 40 cents a minute be?
 
 
Hmm... 40*60/(1/unit of cash in cents): -24 Dollars -48 Half Dollars -96 Quarters -240 Dimes -480 Nickels -2400 Cents -371.67 Pesos -$2.40 an hour -My Net worth -The budget for Plan 9 From...
 
TEJKIRAT SINGH one month ago
 
Hmm... 40*60/(1/unit of cash in cents): -24 Dollars -48 Half Dollars -96 Quarters -240 Dimes -480 Nickels -2400 Cents -371.67 Pesos -$2.40 an hour -My Net worth -The budget for Plan 9 From...
 
vikas yadav one month ago
what a 11 th std boy to do to achieve jipmer. now i am finished 10 th . and got 9.6cgpa. next i want to take science stream. i think so.. give me a correct schedule for studying in home
 
 
You have got good scores and have a bright future.The Jawaharlal Institute of Postgraduate Medical Education & Research (JIPMER) is a medical school in India, and the oldest to teach...
  img
Dinesh 10 months ago
Sir, I secured 374 marks in BITSAT but just 200/360 in advance paper. I did some research on what i cn get with this. Being a girl, branches like civil or chemical are already discarded by...
 
 
Hello See if you join CS in BITs you will have nice placements most probably. But if you join IIT bombay with aerospace engineering you're gonna learn a lot of stuffs other that just the...
  img
Arun Kumar 10 months ago
 
depends upon your interest in those subjects. have you had a look at the curriculum for each course? many girls like chemistry and physics and do research in those fields like my mother. so...
 
Vineet Vinayak 10 months ago
 
Amy ,I am also seeking some good advise.. My son has scored 197 in Advance.. expecting between 1800 to 2300.. I am also thinking of Aerospace or Mathematics .. Do IITs give B.tech degree in...
 
anil 10 months ago
what should i do for it?
 
 
you should just study for your better future...........all the best’
 
ayush pandey 3 months ago
View all Questions »