MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: R

There are no items in this cart.
Continue Shopping
Menu
Get instant 20% OFF on Online Material.
coupon code: MOB20 | View Course list

  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: R 15,000
  • View Details
Get extra R 4,500 off
USE CODE: Venkat30

				   

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


 

5 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
           
************** ************ **************************************************** ********** ******************************************************* *************************************
5 years ago

Post Your Answer

Other Related Questions on IIT JEE Entrance Exam

Is it worth dropping for JEE now? ItsJuly, JEE mains98(cutoff-100) AIR133000, 87.8%CBSE,messed up 12(preboards-31%)determined to work hard now, coaching tomorrow, didnt read since june1
 
 
You can continue for coaching from now onwards. its just starting...try hard and prepare like 300 days you have... Follow a time table, strict to the plans and strategy and go forward.
  img
Saurabh Kumar 2 months ago
 
@ yatinder havenot u got any iiit this year , even if their seat will vacant , they can take unqualified student also , and yes , its worth dropping as your scores are good , but do...
 
Umakant biswal 2 months ago
 
hi yatinder i think dropping a year is not a bad idea for you. this s because you are very near to cuoff this year and you have also got good marks in your cbse exams. but you should be...
 
SAHIL 2 months ago
sir/mam i want to ask is zero even or odd or both or none which one should i consider
 
 
hi gaurabg zer is considered as a even number. a number is considered as even if it is divisible by 2 exactly. only due to this reason we consider zero as even thanks post if still some...
 
SAHIL one month ago
 
Hello Gaurang , According to me zero should be considered as even ,because of its divisibility by 2 , as we know a number is said to be even if its divisible by 2.
 
jus one month ago
 
Hi Gaurang According to me an integer is odd if dividing it by 2 does not yeilds an integer but on dividing 0 by 2 we get an integer “0” so 0 is even
 
Ankit Jaiswal one month ago
CBSE board one person got 481 and 179 in board and jee Mains respectively other one got 475 and 183. But their jee Mains rank is in 4000s and 8000s. Both are in general category. Does it...
 
 
@ thiagar HOW can that happen ?? the rank will not come in that much diffrence , you have 60 percent weightage for jee main score , and 40 percent weightage for board marks or percentage ....
 
Umakant biswal 2 months ago
 
It is little confusing dear, actually, if you aspire to get a seat in a reputed institution then you need to perform well in JEE or else you may try seeking admission in a reputed...
 
Aneesh Sehgal 2 months ago
 
Thanks for your answer. No 475 and 481 are cbse board marks. In the Jee Main Rank card the 475 mark had a normalised scored of 184 and 481 had a normalised score of 226.
 
Thiagarajan 2 months ago
tell me top engg collages in andhra pradesh??????????????
 
 
Dear Chetan Sreedevi women,s college,MVSR college,Deccan college,Muffacam colleges are top colleges in andhra pradesh
 
Prabhakar ch 8 months ago
 
Sreedevi women,s college,MVSR college,Deccan college,Muffacam colleges are top colleges in andhra pradesh sreedevi womens college,mvsr college,deccan college,muffacam colleges are top...
 
SAI SANDY 8 months ago
 
Sreedevi women,s college,MVSR college,Deccan college,Muffacam colleges are top colleges in andhra pradesh sreedevi womens college,mvsr college,deccan college,muffacam colleges are top...
 
raj 8 months ago
nit raipur vs iiit jabalpur which is better..? please reply soon
 
 
The problems of good faculty is always there. Franckly speekng, this problem is also present in the newer IITs. Now you can image. In B.Tech, don’t entirely depends on the faculties.
  img
Vijay Mukati one year ago
 
Choice is yours. I will suggest you to go through the official website of jee mains to see the previous year opening and closing rank for different rounds. Thanks.
  img
Vijay Mukati one year ago
 
NIT R is older institute and hence is equiped with the all the facilites. All is Well.!!!!
  img
Vijay Mukati one year ago
why maximum of the people choose iits ? can u give me explination>??
 
 
IITs are considered as the best institute for Engineering students. Best talents from the country choose these institutes because for its best educaton and environment there. They are also...
  img
Vijay Mukati 8 months ago
 
Dear Dheeru Maximum of the people choose iits because of some huge reasons.There is good quality of FOOD , BED and ENJOYEMENT All the best for your bright future
 
Prabhakar ch 8 months ago
 
HAI DHEERU CHOWDARY MOST OF THE STUDENTS IN INDIA CHOOSES IITS WHY BECAUSE IN IITS ADMINISTRATION AND FACULTY ARE VERY WELL.AND ALSO JOB OPPORTUNITIES ARE VERY WELL.
 
RAMCHANDRARAO 8 months ago
View all Questions »

  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: R 15,000
  • View Details
Get extra R 4,500 off
USE CODE: Venkat30

  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: R 15,000
  • View Details

Get extra R 4,500 off
USE CODE: Venkat30

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